{"id":16917,"date":"2024-11-25T17:55:52","date_gmt":"2024-11-25T20:55:52","guid":{"rendered":"https:\/\/hangarmma.com.br\/blog\/?post_type=glossary&#038;p=16917"},"modified":"2024-11-25T17:55:53","modified_gmt":"2024-11-25T20:55:53","slug":"eletromagnetismo-2","status":"publish","type":"glossary","link":"https:\/\/hangarmma.com.br\/blog\/eletromagnetismo-2\/","title":{"rendered":"Eletromagnetismo"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Hans Christian Oersted descobriu, em 1819, que um <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_836e2c427cf3ef8bcecf9248b98be024\" data-link=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" href=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">condutor<\/a> sob <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_4710df4070fec638157d5fcb01d8a2fa\" data-link=\"https:\/\/hangarmma.com.br\/blog\/corrente-eletrica\/\" href=\"https:\/\/hangarmma.com.br\/blog\/corrente-eletrica\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">corrente el&#xE9;trica<\/a> gera um <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_a4549d2e9e58266b18c1d0e9c7fa7fff\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo magn&#xE9;tico<\/a> capaz de desviar a agulha de uma <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_d0079456625ab29ec656baa4c8326122\" data-link=\"https:\/\/hangarmma.com.br\/blog\/bussola\/\" href=\"https:\/\/hangarmma.com.br\/blog\/bussola\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">b&#xFA;ssola<\/a>. Esse <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_a4549d2e9e58266b18c1d0e9c7fa7fff\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo magn&#xE9;tico<\/a> n&#xE3;o est&#xE1; ligado ao material do <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_836e2c427cf3ef8bcecf9248b98be024\" data-link=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" href=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">condutor<\/a>, mas ao movimento dos el&#xE9;trons nele. A intensidade do <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_a4549d2e9e58266b18c1d0e9c7fa7fff\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo magn&#xE9;tico<\/a> &#xE9; diretamente proporcional &#xE0; <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_4710df4070fec638157d5fcb01d8a2fa\" data-link=\"https:\/\/hangarmma.com.br\/blog\/corrente-eletrica\/\" href=\"https:\/\/hangarmma.com.br\/blog\/corrente-eletrica\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">corrente el&#xE9;trica<\/a> que flui pelo <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_836e2c427cf3ef8bcecf9248b98be024\" data-link=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" href=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">condutor<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ao redor de um fio conduzindo corrente, o <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_a4549d2e9e58266b18c1d0e9c7fa7fff\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo magn&#xE9;tico<\/a> forma c&#xED;rculos conc&#xEA;ntricos, criando um padr&#xE3;o cil&#xED;ndrico. Se a corrente aumenta, o <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_068265665566ae80bef02051e8441e2d\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo<\/a> se expande proporcionalmente, indicando maior intensidade. Esse comportamento estacion&#xE1;rio do <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_068265665566ae80bef02051e8441e2d\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo<\/a> ocorre em correntes cont&#xED;nuas constantes; quando a corrente cessa, o <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_068265665566ae80bef02051e8441e2d\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo<\/a> desaparece.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A dire&#xE7;&#xE3;o do <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_a4549d2e9e58266b18c1d0e9c7fa7fff\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo magn&#xE9;tico<\/a> pode ser determinada pela <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_bbd199d698e391914d5944ed215f8ed6\" data-link=\"https:\/\/hangarmma.com.br\/blog\/regra-da-mao-esquerda\/\" href=\"https:\/\/hangarmma.com.br\/blog\/regra-da-mao-esquerda\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">regra da m&#xE3;o esquerda<\/a>: segurando o <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_836e2c427cf3ef8bcecf9248b98be024\" data-link=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" href=\"https:\/\/hangarmma.com.br\/blog\/condutor\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">condutor<\/a> com a m&#xE3;o esquerda, o polegar aponta o fluxo da corrente, enquanto os dedos indicam o sentido das linhas de for&#xE7;a magn&#xE9;tica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quando o fio &#xE9; enrolado em voltas (loops), os campos magn&#xE9;ticos individuais se combinam, aumentando a intensidade dentro da <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_a83c7888185add07a6e47eb042dd3c14\" data-link=\"https:\/\/hangarmma.com.br\/blog\/bobina\/\" href=\"https:\/\/hangarmma.com.br\/blog\/bobina\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">bobina<\/a>. Se o fio &#xE9; enrolado ao redor de um n&#xFA;cleo de ferro, cria-se um <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_f8f21458346bcfeb6f12fde1759f0251\" data-link=\"https:\/\/hangarmma.com.br\/blog\/eletroima\/\" href=\"https:\/\/hangarmma.com.br\/blog\/eletroima\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">eletro&#xED;m&#xE3;<\/a>, concentrando as linhas de for&#xE7;a no n&#xFA;cleo e amplificando o <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_a4549d2e9e58266b18c1d0e9c7fa7fff\" data-link=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" href=\"https:\/\/hangarmma.com.br\/blog\/campo-magnetico-2\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">campo magn&#xE9;tico<\/a>. A <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_68df3eaef4ce59f51ab41aa391a7a658\" data-link=\"https:\/\/hangarmma.com.br\/blog\/polaridade\/\" href=\"https:\/\/hangarmma.com.br\/blog\/polaridade\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">polaridade<\/a> do <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_f8f21458346bcfeb6f12fde1759f0251\" data-link=\"https:\/\/hangarmma.com.br\/blog\/eletroima\/\" href=\"https:\/\/hangarmma.com.br\/blog\/eletroima\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">eletro&#xED;m&#xE3;<\/a> segue a <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_bbd199d698e391914d5944ed215f8ed6\" data-link=\"https:\/\/hangarmma.com.br\/blog\/regra-da-mao-esquerda\/\" href=\"https:\/\/hangarmma.com.br\/blog\/regra-da-mao-esquerda\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">regra da m&#xE3;o esquerda<\/a> e pode ser revertida ao inverter o <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_860c49877405ff43f6c73ed49464ba8d\" data-link=\"https:\/\/hangarmma.com.br\/blog\/fluxo-de-corrente\/\" href=\"https:\/\/hangarmma.com.br\/blog\/fluxo-de-corrente\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">fluxo de corrente<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_5528edf3863645f630a605ea9c5a4fd5\" data-link=\"https:\/\/hangarmma.com.br\/blog\/eletroimas\/\" href=\"https:\/\/hangarmma.com.br\/blog\/eletroimas\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">Eletro&#xED;m&#xE3;s<\/a> t&#xEA;m ampla aplica&#xE7;&#xE3;o em dispositivos como motores, geradores, <a class=\"glossaryLink\" aria-describedby=\"tt\" data-cmtooltip=\"cmtt_7fe2a76f87e56c50289bc11712c33222\" data-link=\"https:\/\/hangarmma.com.br\/blog\/reles-2\/\" href=\"https:\/\/hangarmma.com.br\/blog\/reles-2\/\" target=\"_blank\" data-mobile-support=\"0\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">rel&#xE9;s<\/a> e solen&oacute;ides. O solen&oacute;ide, por exemplo, utiliza a for&ccedil;a magn&eacute;tica para atrair um n&uacute;cleo m&oacute;vel, acionando mecanismos como v&aacute;lvulas ou interruptores de alta corrente. Esses princ&iacute;pios formam a <a class=\"glossaryLink\"  aria-describedby=\"tt\"  data-cmtooltip=\"cmtt_b2cc1dc32dcd28dea2c5a1827ef2bbd7\"  data-link=\"https:\/\/hangarmma.com.br\/blog\/base\/\"  href=\"https:\/\/hangarmma.com.br\/blog\/base\/\"  target=\"_blank\"  data-mobile-support=\"0\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>base<\/a> de muitos sistemas el&eacute;tricos e eletr&ocirc;nicos modernos, incluindo aqueles utilizados em aeronaves&#12304;8&dagger;source&#12305;&#12304;9&dagger;source&#12305;&#12304;11&dagger;source&#12305;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hans Christian Oersted descobriu, em 1819, que um condutor sob corrente el\u00e9trica gera um campo magn\u00e9tico capaz de desviar a agulha de uma b\u00fassola. Esse campo magn\u00e9tico n\u00e3o est\u00e1 ligado ao material do condutor, mas ao movimento dos el\u00e9trons nele. A intensidade do campo magn\u00e9tico \u00e9 diretamente proporcional \u00e0 corrente el\u00e9trica que flui pelo condutor. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"glossary-categories":[],"glossary-tags":[],"class_list":["post-16917","glossary","type-glossary","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Eletromagnetismo - HANGAR MMA<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hangarmma.com.br\/blog\/eletromagnetismo-2\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Eletromagnetismo - HANGAR MMA\" \/>\n<meta property=\"og:description\" content=\"Hans Christian Oersted descobriu, em 1819, que um condutor sob corrente el\u00e9trica gera um campo magn\u00e9tico capaz de desviar a agulha de uma b\u00fassola. 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[&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hangarmma.com.br\/blog\/eletromagnetismo-2\/\" \/>\n<meta property=\"og:site_name\" content=\"HANGAR MMA\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SimuladosMMA\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-25T20:55:53+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/eletromagnetismo-2\\\/\",\"url\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/eletromagnetismo-2\\\/\",\"name\":\"Eletromagnetismo - HANGAR MMA\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/#website\"},\"datePublished\":\"2024-11-25T20:55:52+00:00\",\"dateModified\":\"2024-11-25T20:55:53+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/eletromagnetismo-2\\\/#breadcrumb\"},\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/eletromagnetismo-2\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/eletromagnetismo-2\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"In\u00edcio\",\"item\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Eletromagnetismo\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/\",\"name\":\"HANGAR MMA\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"pt-BR\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/#organization\",\"name\":\"HANGAR MMA\",\"url\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-BR\",\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/hangarmma.simuladosanac.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/pp-1.jpg\",\"contentUrl\":\"https:\\\/\\\/hangarmma.simuladosanac.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/pp-1.jpg\",\"width\":207,\"height\":207,\"caption\":\"HANGAR MMA\"},\"image\":{\"@id\":\"https:\\\/\\\/hangarmma.com.br\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/SimuladosMMA\",\"https:\\\/\\\/www.instagram.com\\\/hangar_mma\\\/\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UCV1vx9I33-R1F8_bGVLBttg\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Eletromagnetismo - HANGAR MMA","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/hangarmma.com.br\/blog\/eletromagnetismo-2\/","og_locale":"pt_BR","og_type":"article","og_title":"Eletromagnetismo - HANGAR MMA","og_description":"Hans Christian Oersted descobriu, em 1819, que um condutor sob corrente el\u00e9trica gera um campo magn\u00e9tico capaz de desviar a agulha de uma b\u00fassola. 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