{"id":254,"date":"2014-12-05T17:07:34","date_gmt":"2014-12-05T17:07:34","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=254"},"modified":"2024-08-20T10:18:06","modified_gmt":"2024-08-20T10:18:06","slug":"imas-e-campo-magnetico","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/eletricidade\/eletromagnetismo\/imas-e-campo-magnetico\/","title":{"rendered":"Im\u00e3s e Campo Magn\u00e9tico"},"content":{"rendered":"<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>IM\u00c3S E CAMPO MAGN\u00c9TICO<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><span style=\"color: #c00000;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>IM\u00c3S<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Desde a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>antiguidade se conhecia um mineral, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>hoje denominado <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>magnetita,<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> composto basicamente por <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>\u00f3xido de ferro (Fe<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><sub><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>3<\/b><\/span><\/span><\/sub><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>O<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><sub><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>4<\/b><\/span><\/span><\/sub><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>) <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>que <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>possu\u00eda propriedade de atrair alguns minerais como o ferro, o n\u00edquel e<\/b><\/span><\/span><\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_d62b8cb1.png\" alt=\"\" width=\"774\" height=\"115\" name=\"Imagem 61\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>o cobalto e pedras de \u00f3xidos de ferro e que s\u00e3o denominadas de\u00a0im\u00e3s naturais.<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Essa propriedade recebe o nome de magnetismo e as regi\u00f5es do im\u00e3 onde as\u00a0propriedades magn\u00e9ticas s\u00e3o mais intensas\u00a0s\u00e3o denominadas de\u00a0polos do im\u00e3.<\/b><\/span><\/span><\/span><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_780add21.png\" alt=\"\" width=\"774\" height=\"171\" name=\"Imagem 62\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #c00000;\">\u00a0<\/span><\/p>\n<p align=\"JUSTIFY\"><img decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_3bd11a42.png\" alt=\"\" width=\"774\" height=\"231\" name=\"Imagem 63\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p align=\"JUSTIFY\"><span style=\"color: #c00000;\">\u00a0<\/span><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>O que voc\u00ea deve saber, informa\u00e7\u00f5es e dicas<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 64\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_c305df9c.png\" alt=\"\" width=\"562\" height=\"95\" name=\"Imagem 65\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 66\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Observe que a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>for\u00e7a de atra\u00e7\u00e3o entre um im\u00e3 e um peda\u00e7o de ferro<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> ou as <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>for\u00e7as de atra\u00e7\u00e3o ou de <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>repuls\u00e3o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: medium;\"><b>entre dois im\u00e3s n\u00e3o \u00e9 de origem el\u00e9trica, pois os corpos n\u00e3o est\u00e3o eletrizados.<br \/>\n<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Trata-se de <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>for\u00e7as magn\u00e9ticas <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e que <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>obedecem ao princ\u00edpio da a\u00e7\u00e3o e rea\u00e7\u00e3o (terceira lei de Newton), <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>pois tem a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>mesma intensidade, mesma dire\u00e7\u00e3o, mas sentidos opostos.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 1\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>B\u00fassola<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Uma <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>b\u00fassola<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> consta de uma <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>agulha magn\u00e9tica <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>colocada na <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>posi\u00e7\u00e3o horizontal, suspensa<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> pelo<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_ff6f09d6.png\" alt=\"\" width=\"775\" height=\"190\" name=\"Imagem 4\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>centro de gravidade, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>indicando sempre a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>dire\u00e7\u00e3o norte-sul.<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 5\" align=\"BOTTOM\" border=\"0\" \/><span style=\"color: #c00000;\">\u00a0<\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>A <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Terra se comporta como um grande im\u00e3 <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>onde o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo Sul magn\u00e9tico est\u00e1 aproximadamente localizado no polo Norte geogr\u00e1fico e vice versa.<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Se voc\u00ea <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>pendurar um im\u00e3 em forma de barra pelo seu centro <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>ou <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>observar a agulha magn\u00e9tica<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> de uma <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>b\u00fassola voc\u00ea ver\u00e1 que seus polos ficam sempre alinhados na dire\u00e7\u00e3o norte-sul.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_b513b6cf.png\" alt=\"\" width=\"633\" height=\"241\" name=\"Imagem 7\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>O <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo que indicar o polo norte geogr\u00e1fico <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>recebe o nome de <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo norte e estar\u00e1 indicando <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo sul magn\u00e9tico da Terra. <\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>O <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo que indicar o polo sul geogr\u00e1fico <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>recebe o nome de <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo sul <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e estar\u00e1 <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>indicando o polo norte magn\u00e9tico da Terra. <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Tudo isso ocorre <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>porque polos de nomes opostos se atraem<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Observa\u00e7\u00e3o:<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> O polo <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Norte geogr\u00e1fico n\u00e3o coincide exatamente com o polo Sul magn\u00e9tico, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>distando um do outro <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>aproximadamente 1.900km.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 8\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>Inseparabilidade dos polos magn\u00e9ticos<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Se voc\u00ea <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>quebrar um im\u00e3 <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e em seguida continuar <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>dividindo os im\u00e3s resultantes, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>voc\u00ea observar\u00e1 que <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>cada peda\u00e7o partido continuar\u00e1 sendo um novo im\u00e3 com dois polos, Norte e Sul de maneira que cada peda\u00e7o atraia o outro.\u00a0N\u00e3o existem polos isolados.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_995050e8.png\" alt=\"\" width=\"757\" height=\"285\" name=\"Imagem 9\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 10\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Se voc\u00ea <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>partir um im\u00e3 conforme a figura abaixo,<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>for\u00e7a entre eles ser\u00e1 de repuls\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_909300b1.png\" alt=\"\" width=\"774\" height=\"121\" name=\"Imagem 11\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 2\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_686b6d3f.png\" alt=\"\" width=\"774\" height=\"106\" name=\"Imagem 6\" align=\"BOTTOM\" border=\"0\" \/><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Se voc\u00ea <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>afastar o im\u00e3<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> deixando os <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>pregos fora de sua influ\u00eancia magn\u00e9tica\u00a0<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>os pregos <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>perder\u00e3o suas propriedades magn\u00e9ticas.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 12\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>Rela\u00e7\u00e3o entre a imanta\u00e7\u00e3o e os im\u00e3s elementares<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Um <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>bloco, por exemplo, de ferro, pode encontrar-se:<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_6f0ceee.png\" alt=\"\" width=\"774\" height=\"175\" name=\"Imagem 13\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 14\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_cb379879.png\" alt=\"\" width=\"774\" height=\"123\" name=\"Imagem 21\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Subst\u00e2ncias\u00a0paramagn\u00e9ticas\u00a0<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>s\u00e3o aquelas em que seus im\u00e3s elementares n\u00e3o s\u00e3o facilmente orientados) e esses <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>materiais s\u00e3o fracamente atra\u00eddos pelos im\u00e3s<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, como, por exemplo, <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>o alum\u00ednio, o magn\u00e9sio, o cromo, a platina, o ar, etc.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"JUSTIFY\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_7871b3c7.png\" alt=\"\" width=\"774\" height=\"97\" name=\"Imagem 19\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 22\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_e88c4fa9.png\" alt=\"\" width=\"774\" height=\"145\" name=\"Imagem 68\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_d027f524.png\" alt=\"\" width=\"774\" height=\"148\" name=\"Imagem 18\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 20\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Para <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>magnetizar uma barra de ferro (por exemplo, um prego de a\u00e7o) <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>de forma tempor\u00e1ria basta <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>deslizar um \u00edm\u00e3 sobre o prego da ponta A em dire\u00e7\u00e3o \u00e0 outra ponta B,<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>\u00a0<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\">repetidas vezes<\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, sempre<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>\u00a0<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\">de A para B<\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\">, <\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>conforme a figura. <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Observe que <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>estamos esfregando o polo norte no prego, de A para B.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_3a560936.png\" alt=\"\" width=\"774\" height=\"147\" name=\"Imagem 25\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Depois que o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>prego fica imantado e o im\u00e3 permanente \u00e9 afastado<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, qual <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>extremidade do prego \u00e9 o polo norte e qual \u00e9 o polo Sul?<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Observe a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>sequ\u00eancia abaixo:<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_4bf7ad08.png\" alt=\"\" width=\"774\" height=\"158\" name=\"Imagem 26\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Assim, a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>parte direita do prego (B) <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>que ficou imantado (cabe\u00e7a) \u00e9 o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo sul <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>parte esquerda A, (ponta), \u00e9 o polo norte. \u00a0<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 69\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>A <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>localiza\u00e7\u00e3o dos polos de um im\u00e3 <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>depende de sua <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>forma geom\u00e9trica<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, mas <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>sempre se localizam em oposi\u00e7\u00e3o em rela\u00e7\u00e3o a um plano de simetria, como voc\u00ea pode observar nas figuras abaixo.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_3ebe27a6.png\" alt=\"\" width=\"774\" height=\"133\" name=\"Imagem 70\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 57\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Se um <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>\u00edm\u00e3 permanente, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>em forma de <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>\u201cferradura\u201d<\/b><\/span><\/span><\/span><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, <\/b><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>cujos <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polos norte e sul est\u00e3o indicados <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>na <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>figura I, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>\u00e9 <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>dividido em tr\u00eas partes (figura II), <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>as <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>partes 1, 2 e 3 formar\u00e3o tr\u00eas novos im\u00e3s <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Tahoma,serif;\"><span style=\"font-size: medium;\"><b>(lembre-se de que \u00e9 <\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_e27c19ee.png\" alt=\"\" width=\"562\" height=\"139\" name=\"Imagem 59\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Tahoma,serif;\"><span style=\"font-size: medium;\"><b>imposs\u00edvel obter um polo isolado) com as <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Tahoma,serif;\"><span style=\"font-size: medium;\"><b>polaridades indicadas na figura III.<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>\u00a0<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>Campo magn\u00e9tico<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Um <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>im\u00e3 origina numa regi\u00e3o ao seu redor um campo magn\u00e9tico (<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_a068d7cd.png\" alt=\"\" width=\"14\" height=\"18\" name=\"Imagem 16\" align=\"BOTTOM\" border=\"0\" \/>), <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>o que se <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>pode comprovar colocando nessa regi\u00e3o um corpo com propriedades magn\u00e9ticas e observando que sobre ele surge uma for\u00e7a de origem magn\u00e9tica.<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Convenciona-se como forma de visualizar um campo magn\u00e9tico as linhas de indu\u00e7\u00e3o (linhas de campo ou linhas de for\u00e7a)<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, que podem ser <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>representadas<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> supondo que\u00a0<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>pequenas part\u00edculas magn\u00e9ticas elementares se desloquem \u00fanica e exclusivamente sob a\u00e7\u00e3o do campo magn\u00e9tico. <\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>A <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>trajet\u00f3ria dessas part\u00edculas representa as linhas de indu\u00e7\u00e3o do campo magn\u00e9tico (figura I).<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_b59ead94.jpg\" alt=\"\" width=\"774\" height=\"198\" name=\"Imagem 34\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Essas <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>linhas de indu\u00e7\u00e3o tamb\u00e9m podem ser visualizadas colocando-se sobre o im\u00e3 min\u00fasculas part\u00edculas (limalhas) de ferro e elas se distribuir\u00e3o conforme a figura II.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b><br \/>\n<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>O que voc\u00ea deve saber, informa\u00e7\u00f5es e dicas<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 28\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_bc0b530b.png\" alt=\"\" width=\"774\" height=\"188\" name=\"Imagem 30\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 67\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_7266d78f.png\" alt=\"\" width=\"774\" height=\"213\" name=\"Imagem 33\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 3\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Uma <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>agulha magn\u00e9tica<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> (por exemplo, de uma <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>b\u00fassola<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>) ter\u00e1 <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>cada ponto seu polo norte apontando <\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_88c06464.png\" alt=\"\" width=\"774\" height=\"274\" name=\"Imagem 15\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>sempre no sentido de\u00a0<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_a068d7cd.png\" alt=\"\" width=\"14\" height=\"18\" name=\"Imagem 24\" align=\"BOTTOM\" border=\"0\" \/>, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>conforme <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>indicado nos pontos P, Q, R e S da figura.<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Assim, quando um <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>im\u00e3 \u00e9 colocado num campo magn\u00e9tico, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>sobre o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo norte atua uma for\u00e7a na mesma dire\u00e7\u00e3o e sentido do campo <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e sobre o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo sul atua uma for\u00e7a na mesma dire\u00e7\u00e3o e de sentido contr\u00e1rio ao do campo.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 17\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_3e5fa8c4.png\" alt=\"\" width=\"774\" height=\"222\" name=\"Imagem 32\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_3c5e072d.png\" alt=\"\" width=\"774\" height=\"195\" name=\"Imagem 35\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>a) O im\u00e3 \u00e9<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>barra N <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>porque seus <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polos<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, onde as <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>propriedades magn\u00e9ticas s\u00e3o mais intensas atraem qualquer posi\u00e7\u00e3o da barra de ferro, que \u00e9 a M. (im\u00e3 atrai ferro, independente da polaridade).<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>b) <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>A <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>barra M poderia cair<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, pois a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>regi\u00e3o central <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>do im\u00e3 possui <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>propriedades magn\u00e9ticas menos intensas<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, ao contr\u00e1rio dos polos onde \u00e9 m\u00e1xima.<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 37\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_778596b3.png\" alt=\"\" width=\"774\" height=\"203\" name=\"Imagem 38\" align=\"BOTTOM\" border=\"0\" \/><span style=\"color: #c00000;\">\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_74866432.png\" alt=\"\" width=\"50\" height=\"20\" name=\"Imagem 40\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Analise <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>na figura abaixo as <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>linhas de indu\u00e7\u00e3o do campo magn\u00e9tico terrestre <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e observe que a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>agulha magn\u00e9tica de uma b\u00fassola tem a propriedade de se alinhar de acordo com as linhas do campo geomagn\u00e9tico.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_aab5a4d9.png\" alt=\"\" width=\"764\" height=\"310\" name=\"Imagem 39\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Analisando a figura onde est\u00e3o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>representadas estas linhas, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>observe que o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo sul <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>do <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>ponteiro das b\u00fassolas aponta para o polo Sul geogr\u00e1fico, porque o Norte geogr\u00e1fico corresponde ao Sul magn\u00e9tico.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>Campo magn\u00e9tico uniforme<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_7550882d.png\" alt=\"\" width=\"774\" height=\"205\" name=\"Imagem 42\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\"><b>Influ\u00eancia de um campo magn\u00e9tico uniforme sobre um im\u00e3<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\">\u00a0<\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Os <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>im\u00e3s da figura abaixo <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>est\u00e3o colocados no <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>interior de um campo magn\u00e9tico uniforme. <\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Considere <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>somente as a\u00e7\u00f5es magn\u00e9ticas <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>classifique<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, em cada caso, o <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>tipo de equil\u00edbrio<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_af719ad1.png\" alt=\"\" width=\"764\" height=\"183\" name=\"Imagem 127\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Os im\u00e3s se orientam sempre com o polo norte no sentido de\u00a0<img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_a068d7cd.png\" alt=\"\" width=\"14\" height=\"18\" name=\"Imagem 23\" align=\"BOTTOM\" border=\"0\" \/>, ou seja, para a direita. <\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Assim <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>no polo norte surge uma for\u00e7a puxando-o para a direita <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>e no <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>polo sul surge uma for\u00e7a puxando-o para a esquerda.<\/b><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Na <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>figura 1, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>se voc\u00ea <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>tirar (girar) um pouco o im\u00e3 da posi\u00e7\u00e3o em que ele se encontra<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, ele <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>girar\u00e1,<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> pois est\u00e1 <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>em equil\u00edbrio inst\u00e1vel\u00a0at\u00e9 atingir o equil\u00edbrio est\u00e1vel (polo norte para a direita).<br \/>\n<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Na <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>figura 2, <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>se voc\u00ea <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>tirar (girar) <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>um pouco o im\u00e3 <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>da posi\u00e7\u00e3o em que ele se encontra<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>ele retornar\u00e1 <\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>a <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>ela, pois est\u00e1 em\u00a0equil\u00edbrio est\u00e1vel.<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b><br \/>\nNa <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>figura 3<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>, ele est\u00e1 em\u00a0<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>equil\u00edbrio inst\u00e1vel<\/b><\/span><\/span><\/span><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>,\u00a0<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>pois girar\u00e1 de 90<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><sup><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>o\u00a0<\/b><\/span><\/span><\/sup><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>no sentido anti-hor\u00e1rio at\u00e9 atingir o equil\u00edbrio est\u00e1vel.<\/b><\/span><\/span><\/span><\/p>\n<p align=\"CENTER\"><span style=\"color: #0000cc;\"><span style=\"font-family: Arial Black,serif;\"><span style=\"font-size: large;\">Campo magn\u00e9tico resultante<\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_43ba5aff.png\" alt=\"\" width=\"18\" height=\"14\" name=\"Imagem 185\" align=\"BOTTOM\" border=\"0\" \/><span style=\"color: #0000cc;\"> <span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Exemplo I:<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_db848fdd.png\" alt=\"\" width=\"774\" height=\"182\" name=\"Imagem 188\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_3600f761.png\" alt=\"\" width=\"774\" height=\"127\" name=\"Imagem 190\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_43ba5aff.png\" alt=\"\" width=\"18\" height=\"14\" name=\"Imagem 186\" align=\"BOTTOM\" border=\"0\" \/> <span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Exemplo II<\/b><\/span><\/span><\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_b79c1231.png\" alt=\"\" width=\"774\" height=\"264\" name=\"Imagem 191\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #c00000;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>Colocando no <\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>ponto 0 todos os vetores de intensidade B, que se afastam dos polos norte e chegam <\/b><\/span><\/span><\/span><\/p>\n<p><a name=\"_GoBack\"><\/a> <img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/fisicaevestibular.com.br\/novo\/wp-content\/uploads\/migracao\/eletromag\/ima\/i_049424ffb24fb4ee_html_5c834ab1.png\" alt=\"\" width=\"774\" height=\"238\" name=\"Imagem 256\" align=\"BOTTOM\" border=\"0\" \/><\/p>\n<p><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>aos polos sul. R- B<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><sub><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>R<\/b><\/span><\/span><\/sub><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> = 2,83B e 45<\/b><\/span><\/span><\/span><span style=\"color: #0000cc;\"><sup><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b>o<\/b><\/span><\/span><\/sup><\/span><span style=\"color: #0000cc;\"><span style=\"font-family: Arial,serif;\"><span style=\"font-size: medium;\"><b> com o eixo x.<\/b><\/span><\/span><\/span><\/p>\n<p>&nbsp;<\/p>\n<h3 class=\"MsoNormal\"><span style=\"color: #000080;\"><b><a style=\"color: #000080;\" href=\"http:\/\/fisicaevestibular.com.br\/exe_mag_1.htm\">Exerc\u00edcios<\/a><\/b><\/span><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>IM\u00c3S E CAMPO MAGN\u00c9TICO IM\u00c3S Desde a antiguidade se conhecia um mineral, hoje denominado magnetita, composto basicamente por \u00f3xido de ferro (Fe3O4) que possu\u00eda propriedade de atrair alguns minerais como o ferro, o n\u00edquel e o cobalto e pedras de \u00f3xidos de ferro e que s\u00e3o denominadas de\u00a0im\u00e3s naturais. Essa propriedade recebe o nome de magnetismo e as regi\u00f5es do<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":243,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-254","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/254","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=254"}],"version-history":[{"count":3,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/254\/revisions"}],"predecessor-version":[{"id":10585,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/254\/revisions\/10585"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/243"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=254"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}