{"id":54332,"date":"2021-09-02T09:00:00","date_gmt":"2021-09-02T12:00:00","guid":{"rendered":"https:\/\/blog.estrategiavestibulares.com.br\/?p=54332"},"modified":"2024-09-26T10:09:10","modified_gmt":"2024-09-26T13:09:10","slug":"magnetismo-no-enem","status":"publish","type":"post","link":"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/magnetismo-no-enem\/","title":{"rendered":"Magnetismo no Enem: conceitos, assuntos, f\u00f3rmulas e mais!"},"content":{"rendered":"<p class=\"wp-block-paragraph\">A atra&ccedil;&atilde;o magn&eacute;tica faz parte de muitas ferramentas presentes no cotidiano. A b&uacute;ssola, as portas de geladeira, os mecanismos de microondas, brincos posti&ccedil;os e outros objetos representam essa realidade. Por isso, os vestibulares cobram o assunto e voc&ecirc; deve conhecer o que cai sobre o <span id=\"urn:enhancement-e881a47d-6c01-4e3d-ac01-98548e610bec\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/magnetismo\">magnetismo<\/span> no <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/noticias\/enem-2021-prova-tem-3-milhoes-de-candidatos-confirmados\/\" target=\"_blank\">Enem<\/a>!<p class=\"wp-block-paragraph\">Para facilitar seus estudos, o Estrat&eacute;gia Vestibulares preparou o artigo a seguir, onde voc&ecirc; encontra as principais informa&ccedil;&otilde;es e caracter&iacute;sticas do assunto: campo e <span id=\"urn:enhancement-46d60c0e-0a2c-4649-91c8-5245ede91c51\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca\">for&ccedil;a<\/span> magn&eacute;ticos e <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/inducao-eletromagnetica\/\" target=\"_blank\">indu&ccedil;&atilde;o eletromagn&eacute;tica<\/a>.&nbsp;<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Navegue pelo conte\u00fado<\/p>\n<\/div><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/magnetismo-no-enem\/#Magnetismo-no-Enem-Conceitos\" >Magnetismo no Enem: Conceitos<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/magnetismo-no-enem\/#Principais-assuntos-sobre-Magnetismo-no-Enem\" >Principais assuntos sobre Magnetismo no Enem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/magnetismo-no-enem\/#Questoes-sobre-Magnetismo-no-Enem\" >Quest&otilde;es sobre Magnetismo no Enem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/magnetismo-no-enem\/#Veja-tambem\" >Veja tamb&eacute;m:<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-magnetismo-no-enem-conceitos\"><span class=\"ez-toc-section\" id=\"Magnetismo-no-Enem-Conceitos\"><\/span>Magnetismo no Enem: Conceitos<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">O <span id=\"urn:local-annotation-693978\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/magnetismo\">magnetismo<\/span> est&aacute; relacionado com a cria&ccedil;&atilde;o de campos, os quais geram atra&ccedil;&atilde;o ou <span id=\"urn:enhancement-948d5925-e6f6-4d30-8767-6e1b02d364e9\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/repulsao\">repuls&atilde;o<\/span> conforme a intera&ccedil;&atilde;o entre os p&oacute;los.&nbsp;<\/p><p class=\"wp-block-paragraph\">Um <strong>&iacute;m&atilde; <\/strong>&eacute; um <span id=\"urn:enhancement-11190f2e-a140-4fed-8017-8f33d598eca8\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/material\">material<\/span> que possui dois focos magn&eacute;ticos opostos e insepar&aacute;veis. Eles s&atilde;o nomeados, por conven&ccedil;&atilde;o, como p&oacute;lo norte e polo sul. O composto imant&aacute;vel &eacute; capaz de atrair elementos como N&iacute;quel, Ferro e Cobalto.&nbsp;<\/p><p class=\"wp-block-paragraph\">Veja, na imagem a seguir, um esquema de &iacute;m&atilde;:<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"620\" height=\"486\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-17.png\" alt=\"Magnetismo no Enem: &iacute;m&atilde;\" class=\"wp-image-54334\" srcset=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-17.png 620w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-17-300x235.png 300w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-17-380x298.png 380w\" sizes=\"(max-width: 620px) 100vw, 620px\" \/><\/figure>\n<\/div><h3 class=\"wp-block-heading\" id=\"h-interacao-entre-imas\">Intera&ccedil;&atilde;o entre &iacute;m&atilde;s<\/h3><p class=\"wp-block-paragraph\">Quando dois ou mais &iacute;m&atilde;s s&atilde;o aproximados, eles podem interagir por <span id=\"urn:enhancement-31531568-3346-4923-8729-e06ecf782ef2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/repulsao\">repuls&atilde;o<\/span> ou por atra&ccedil;&atilde;o. Isso acontece da seguinte forma:<\/p><ul class=\"wp-block-list\">\n<li><strong>Polos iguais <\/strong>(norte + norte ou sul + sul)<strong>:<\/strong> ocorre a repuls&atilde;o entre os materiais, e ocorre uma for&ccedil;a de afastamento;<\/li>\n\n\n\n<li><strong>Polos diferentes <\/strong>(norte+sul)<strong>: <\/strong>os objetos se atraem e &eacute; gerada uma for&ccedil;a de aproxima&ccedil;&atilde;o.&nbsp;<\/li>\n<\/ul><p class=\"wp-block-paragraph\">A ilustra&ccedil;&atilde;o abaixo demonstra tal fen&ocirc;meno.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"542\" height=\"458\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-19.png\" alt=\"Magnetismo: intera&ccedil;&atilde;o entre &iacute;m&atilde;s\" class=\"wp-image-54336\" srcset=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-19.png 542w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-19-300x254.png 300w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-19-380x321.png 380w\" sizes=\"(max-width: 542px) 100vw, 542px\" \/><\/figure>\n<\/div><h2 class=\"wp-block-heading\" id=\"h-principais-assuntos-sobre-magnetismo-no-enem\"><span class=\"ez-toc-section\" id=\"Principais-assuntos-sobre-Magnetismo-no-Enem\"><\/span>Principais assuntos sobre Magnetismo no Enem<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Agora que voc&ecirc; j&aacute; entende os conceitos b&aacute;sicos sobre o assunto, entenda quais s&atilde;o os mais importantes aspectos de <span id=\"urn:enhancement-d23df1a9-28ec-4a3d-9dfc-1891549eedbc\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/magnetismo\">magnetismo<\/span> no <span id=\"urn:enhancement-cb437079-b05e-4b4c-b66b-156575a0ba53\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">Enem<\/span>.<\/p><h3 class=\"wp-block-heading\" id=\"h-campo-magnetico\">Campo magn&eacute;tico<\/h3><p class=\"wp-block-paragraph\">A grandeza <span id=\"urn:enhancement-650173d2-de02-43d3-a1cc-85ade582c5fd\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span>, representada pela letra B, &eacute; determinada pela intera&ccedil;&atilde;o entre o p&oacute;lo e o p&oacute;lo sul do &iacute;m&atilde; e pode ser quantificada pela unidade Tesla (T).<\/p><p class=\"wp-block-paragraph\">O campo possui o seguinte direcionamento: do norte magn&eacute;tico para o sul magn&eacute;tico.&nbsp;<br>As linhas que demarcam essa rela&ccedil;&atilde;o s&atilde;o chamadas de linhas de indu&ccedil;&atilde;o. Quanto maior o n&uacute;mero de linhas e quanto mais pr&oacute;ximas elas estiverem, mais intenso &eacute; o vetor <span id=\"urn:enhancement-ea95f250-2be2-4e14-9a91-61d670f1e800\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span>.&nbsp;<\/p><p class=\"wp-block-paragraph\">Ao determinar o vetor B, ele aparece perpendicularmente &agrave;s linhas de campo, conforme mostra a figura seguinte:<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"430\" height=\"429\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-21.png\" alt=\"Linhas de Indu&ccedil;&atilde;o - EV\" class=\"wp-image-54338\" srcset=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-21.png 430w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-21-300x300.png 300w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-21-150x150.png 150w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-21-80x80.png 80w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-21-380x379.png 380w\" sizes=\"(max-width: 430px) 100vw, 430px\" \/><\/figure>\n<\/div><p class=\"wp-block-paragraph\">Um <span id=\"urn:enhancement-af6d1bc1-7f06-4f67-8615-5896ab5f2de1\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span> pode ser uniforme, quando as linhas de campo s&atilde;o paralelas e equidistantes. Para isso, &eacute; necess&aacute;rio que placas paralelas e opostas se associem, como a imagem abaixo representa:<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" width=\"640\" height=\"640\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/aaaaaaa.jpg\" alt=\"Campo Magn&eacute;tico uniforme\" class=\"wp-image-54339\" style=\"width:336px;height:336px\" srcset=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/aaaaaaa.jpg 640w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/aaaaaaa-300x300.png 300w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/aaaaaaa-150x150.png 150w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/aaaaaaa-80x80.png 80w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/aaaaaaa-380x380.png 380w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n<\/div><p class=\"wp-block-paragraph\">O planeta <span id=\"urn:enhancement-2f23d59e-f6c1-4d70-b931-e73f192a66a7\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/terra\">Terra<\/span> tamb&eacute;m possui um <span id=\"urn:enhancement-d62bbb16-2c3f-4d88-b188-fa8d1a58960a\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span>, que possui p&oacute;los opostos aos p&oacute;los geogr&aacute;ficos. A extremidade norte magn&eacute;tica &eacute; o p&oacute;lo sul geogr&aacute;fico, ao mesmo tempo, a ponta sul magn&eacute;tica &eacute; o p&oacute;lo norte geogr&aacute;fico. Entenda melhor com o esquema abaixo:<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" width=\"640\" height=\"569\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/sssnn-1.png\" alt=\"Polos magn&eacute;ticos terrestres\" class=\"wp-image-54341\" style=\"width:412px;height:366px\" srcset=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/sssnn-1.png 640w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/sssnn-1-300x267.png 300w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/sssnn-1-380x338.png 380w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n<\/div><h3 class=\"wp-block-heading\" id=\"h-forca-magnetica-nbsp\">For&ccedil;a magn&eacute;tica&nbsp;<\/h3><p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-c477ada2-6c17-4d54-98ea-9346589e9bc7\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-magnetica\">for&ccedil;a magn&eacute;tica<\/span> resulta da intera&ccedil;&atilde;o entre o <span id=\"urn:enhancement-1aa6d83a-79cd-4293-b1c0-ab50698a9f47\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span> e as <span id=\"urn:enhancement-e060a97a-87d0-407f-ba35-ec8b1fa49823\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/particulas\">part&iacute;culas<\/span> de um <span id=\"urn:enhancement-50ae1b9f-1948-4d7c-9365-4ec27d2411d5\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/material\">material<\/span> com <span id=\"urn:enhancement-fbed757a-2e14-4555-8c6b-c83ca7cb309e\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/velocidade\">velocidade<\/span> que o atravessa.&nbsp;&nbsp;<\/p><p class=\"wp-block-paragraph\">O valor do vetor <span id=\"urn:enhancement-f6743df2-38a2-4ce4-a123-f2f4f3e61729\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-magnetica\">for&ccedil;a magn&eacute;tica<\/span> &eacute; dependente do valor do <span id=\"urn:enhancement-575f2d0c-1d58-47f9-8e3d-6d1156278733\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span> (B), da quantidade de carga do objeto em movimento (q), da <span id=\"urn:enhancement-1853611e-bbbf-4b50-bc18-0bf14c8e1fc3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/velocidade\">velocidade<\/span> dessa carga (v) e do &acirc;ngulo entre essa <span id=\"urn:enhancement-762e6cfe-9fe6-44bf-80b1-d1cf47f4b4d3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/velocidade\">velocidade<\/span> e as linhas de campo (<strong> <\/strong>&theta;). Isso est&aacute; descrito na seguinte equa&ccedil;&atilde;o:<\/p><p class=\"has-text-align-center wp-block-paragraph\"><strong>F<\/strong><strong><sub>m<\/sub><\/strong><strong>= |q|.v.B.sen &theta;<\/strong><\/p><p class=\"wp-block-paragraph\">Para determinar a dire&ccedil;&atilde;o e o sentido dessa <span id=\"urn:enhancement-6f6b23e9-1eed-4afa-a7f5-b9342a05a448\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca\">for&ccedil;a<\/span>, &eacute; necess&aacute;rio utilizar a <span id=\"urn:enhancement-d3951b8a-49bc-457d-a3fc-60b80cad5e06\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/expressoes-algebricas\">regra<\/span> da m&atilde;o esquerda. Nesse caso, voc&ecirc; deve:<\/p><ul class=\"wp-block-list\">\n<li>abrir a palma da m&atilde;o com o polegar voltado para cima;<\/li>\n\n\n\n<li>posicionar o dedo indicador apontando para direita;<\/li>\n\n\n\n<li>enquanto dedo m&eacute;dio (maior de todos) aponta em dire&ccedil;&atilde;o ao seu peito.&nbsp;<\/li>\n<\/ul><p class=\"wp-block-paragraph\">Agora, saiba que:<\/p><ul class=\"wp-block-list\">\n<li>o seu polegar indica o vetor <span id=\"urn:enhancement-15552ebb-276a-4c1a-9fca-596812fbc7e9\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-magnetica\">for&ccedil;a magn&eacute;tica<\/span>;<\/li>\n\n\n\n<li>o dedo indicador &eacute; o vetor <span id=\"urn:enhancement-c58ca24c-6b3f-447b-bc4c-9f37338fbf0e\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span>;&nbsp;<\/li>\n\n\n\n<li>o maior dedo representa a velocidade;<\/li>\n\n\n\n<li>o &acirc;ngulo entre a velocidade e o <span id=\"urn:enhancement-4de1e427-e63b-47e7-99b5-4aada41db7be\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span> &eacute; a abertura entre o indicador e m&eacute;dio.&nbsp;<\/li>\n<\/ul><p class=\"wp-block-paragraph\">Al&eacute;m disso, &eacute; importante ressaltar que, quando a carga (q)&gt;0 o sentido e dire&ccedil;&atilde;o da <span id=\"urn:enhancement-cfd4e332-d8c4-408e-b8f1-e222e2898d40\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-magnetica\">for&ccedil;a magn&eacute;tica<\/span> &eacute; igual ao indicado pelo ded&atilde;o. De maneira oposta, quando q&lt;0, a <span id=\"urn:enhancement-7cdc9b9b-0fd4-4fca-b950-a4896f11d64a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/expressoes-algebricas\">regra<\/span> da m&atilde;o esquerda fornece o sentido oposto de F<sub>m<\/sub>. Compreenda melhor com o esquema a seguir:<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"260\" height=\"329\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-23.jpg\" alt=\"Magnetismo no Enem: Regra da m&atilde;o\" class=\"wp-image-54343\" srcset=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-23.jpg 260w, https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/08\/image-23-237x300.png 237w\" sizes=\"(max-width: 260px) 100vw, 260px\" \/><\/figure>\n<\/div><p class=\"wp-block-paragraph\"><br><\/p><p class=\"wp-block-paragraph\">Note que:<\/p><ul class=\"wp-block-list\">\n<li>Quando <strong>&nbsp;&theta; = 0&ordm;<\/strong> ou&nbsp; <strong>&theta; = 180&ordm;<\/strong>, o<a href=\"https:\/\/vestibulares.estrategia.com\/portal\/matematica\/seno-cosseno-tangente\/\" target=\"_blank\"> <strong>sen &theta;<\/strong><\/a><strong> = 0<\/strong> e a <span id=\"urn:enhancement-8f89299a-08b1-45c5-80f5-8629bda0f14b\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-magnetica\">for&ccedil;a magn&eacute;tica<\/span> &eacute; igual a 0 e o movimento da part&iacute;cula pelo <span id=\"urn:enhancement-9919ceff-ee0e-4a61-bda8-8017b627d317\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span> &eacute; considerado<strong> retil&iacute;neo e uniforme;<\/strong><\/li>\n\n\n\n<li>Se <strong>&theta; = 90&ordm;<\/strong> o&nbsp; <strong>&nbsp;sen &theta; = 1<\/strong> e a f&oacute;rmula alcan&ccedil;ar&aacute; seu <strong>m&aacute;ximo valor<\/strong>, com a equa&ccedil;&atilde;o <strong>F<sub>m<\/sub>= |q|.v.B.<\/strong><\/li>\n<\/ul><p class=\"wp-block-paragraph\">Com essa <span id=\"urn:enhancement-7520e46d-cb64-43d5-84db-be95044a6b62\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/expressoes-algebricas\">regra<\/span> em mente, voc&ecirc; deve atentar-se para o enunciado da quest&atilde;o e entender o sentido de B e V, assim voc&ecirc; pode encontrar o sentido do polegar (F<sub>m<\/sub>).&nbsp;<\/p><h3 class=\"wp-block-heading\" id=\"h-inducao-eletromagnetica\">Indu&ccedil;&atilde;o eletromagn&eacute;tica<\/h3><p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-4efe1836-9987-4c67-bb26-7313e2e7d339\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/inducao-eletromagnetica\">indu&ccedil;&atilde;o eletromagn&eacute;tica<\/span> acontece quando a <strong>varia&ccedil;&atilde;o de <span id=\"urn:enhancement-a36637ed-110e-4261-b776-dbb908bf13b3\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span> pr&oacute;ximo a um condutor el&eacute;trico induz uma <span id=\"urn:enhancement-33051651-971b-471f-9012-7b761ca0a081\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca\">for&ccedil;a<\/span> eletromotriz<\/strong>.<\/p><p class=\"wp-block-paragraph\">Em termos b&aacute;sicos, isso ocorre quando o n&uacute;mero de linhas de indu&ccedil;&atilde;o varia em um condutor el&eacute;trico e surge uma corrente el&eacute;trica.<br><\/p><p class=\"wp-block-paragraph\">A f&oacute;rmula que representa isso varia conforme o tipo de ferramenta condutora utilizada, em uma espira circular, por exemplo, a f&oacute;rmula ser&aacute;:<\/p><p class=\"has-text-align-center wp-block-paragraph\"><strong>B = &mu;<\/strong><strong><sub>0<\/sub><\/strong><strong>.i\/2.R<\/strong><\/p><p class=\"wp-block-paragraph\">Onde &mu;<sub>0 <\/sub>&eacute; uma constante de <span id=\"urn:enhancement-eac30f22-5316-479a-8976-ca2fd692eb7a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/inducao-eletromagnetica\">indu&ccedil;&atilde;o eletromagn&eacute;tica<\/span>, i &eacute; a corrente induzida e R &eacute; o <span id=\"urn:enhancement-40e676bb-42ed-471b-a7c2-738b2dfe5c28\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/raio\">raio<\/span> da espira.<\/p><h2 class=\"wp-block-heading\" id=\"h-questoes-sobre-magnetismo-no-enem\"><span class=\"ez-toc-section\" id=\"Questoes-sobre-Magnetismo-no-Enem\"><\/span>Quest&otilde;es sobre Magnetismo no Enem<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\"><strong><span id=\"urn:enhancement-10d8cc29-c735-4400-9389-fc3757b7414f\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">Enem<\/span> 2018<\/strong><\/p><p class=\"wp-block-paragraph\">A tecnologia de comunica&ccedil;&atilde;o da etiqueta RFID (chamada de etiqueta inteligente) &eacute; usada h&aacute; anos para rastrear gado, vag&otilde;es de trem, bagagem a&eacute;rea e carros nos ped&aacute;gios. Um modelo mais barato dessas etiquetas pode funcionar sem baterias e &eacute; constitu&iacute;do por tr&ecirc;s componentes: um microprocessador de sil&iacute;cio; uma bobina de metal, feita de cobre ou de alum&iacute;nio, que &eacute; enrolada em um padr&atilde;o circular; e um encapsulador, que &eacute; um <span id=\"urn:enhancement-8ef1c01f-e2ff-42fb-b89e-95f65527e79a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/material\">material<\/span> de vidro ou <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/quimica\/polimeros\/\" target=\"_blank\">pol&iacute;mero <\/a>envolvendo o microprocessador e a bobina. Na presen&ccedil;a de um campo de radiofrequ&ecirc;ncia gerado pelo leitor, a etiqueta transmite sinais. A dist&acirc;ncia de leitura &eacute; determinada pelo tamanho da bobina e pela pot&ecirc;ncia da <span id=\"urn:enhancement-141cd894-de29-4277-b9d5-785d95f1c254\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ondas\">onda<\/span> de r&aacute;dio emitida pelo leitor.<\/p><p class=\"wp-block-paragraph\">Dispon&iacute;vel em: http:\/\/eletronicos.hsw.uol.com.br. Acesso em: 27 fev. 2012 (adaptado)<\/p><p class=\"wp-block-paragraph\">A etiqueta funciona sem pilhas porque o campo<\/p><p class=\"wp-block-paragraph\">a) el&eacute;trico da <span id=\"urn:enhancement-59f3b793-0d04-414f-8907-9a0cef7f7836\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ondas\">onda<\/span> de r&aacute;dio agita el&eacute;trons da bobina.<br>b) el&eacute;trico da <span id=\"urn:enhancement-90c177c6-1e41-41f6-ab66-9696ad4a338f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ondas\">onda<\/span> de r&aacute;dio cria uma tens&atilde;o na bobina.<br>c) magn&eacute;tico da <span id=\"urn:enhancement-d868e5d9-b0bb-42d0-98ef-3a4e372b24c6\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ondas\">onda<\/span> de r&aacute;dio induz corrente na bobina.<br>d) magn&eacute;tico da <span id=\"urn:enhancement-845b67fd-a2db-4536-9cda-da46a67177af\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ondas\">onda<\/span> de r&aacute;dio aquece os fios da bobina.<br>e) magn&eacute;tico da <span id=\"urn:enhancement-89b4c11b-50e3-4a1a-b8b3-2a33166a404c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/ondas\">onda<\/span> de r&aacute;dio diminui a resson&acirc;ncia no interior da bobina.<\/p><p class=\"wp-block-paragraph\">Conforme visto anteriormente neste artigo, quando um <span id=\"urn:enhancement-f7b73f90-8bfb-4a47-af1e-6e39a7d53375\" class=\"textannotation disambiguated wl-thing wl-no-link\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campo-magnetico\">campo magn&eacute;tico<\/span> &eacute; variado nas proximidades de um condutor (como a bobina) &eacute; gerada uma corrente el&eacute;trica induzida, capaz de fazer a etiqueta funcionar sem a presen&ccedil;a de pilhas. Assim, a alternativa correta &eacute; a <strong>letra C<\/strong>.<\/p><h3 class=\"wp-block-heading\" id=\"h-melhore-seu-desempenho-com-o-estrategia\">Melhore seu desempenho com o Estrat&eacute;gia!<\/h3><p class=\"wp-block-paragraph\">Conhe&ccedil;a as aulas de <span id=\"urn:enhancement-092a8825-ae63-4560-ab44-f8f6f23e3f17\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/fisica\">f&iacute;sica<\/span> do estrat&eacute;gia e tenha mais dom&iacute;nio sobre a <span id=\"urn:enhancement-ce2c86c6-2ba3-4940-902b-e93d4742d15f\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/disciplina\">disciplina<\/span> no momento da prova!<\/p><figure class=\"wp-block-embed aligncenter is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"cs-embed cs-embed-responsive\"><iframe title=\"F&iacute;sica para ENEM\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/6EJmZ9cT6Qk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure><p class=\"wp-block-paragraph\">Gostou do conte&uacute;do e da did&aacute;tica? Acesse nosso site e veja mais informa&ccedil;&otilde;es sobre os cursos preparat&oacute;rios, que foram criados para facilitar o seu aprendizado e te ajudar na conquista da aprova&ccedil;&atilde;o no <span id=\"urn:enhancement-ae8b41bc-e339-40dc-ab52-a735a0105423\" class=\"textannotation disambiguated wl-event\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/enem-64632\">Enem<\/span> e curso dos seus sonhos! Clique no banner abaixo:<\/p><p class=\"wp-block-paragraph\"><a id=\"cta\" class=\"cta-imagem\" href=\"https:\/\/vestibulares.estrategia.com\/curso\/pacote-enem\/\" target=\"blank\">\n                <img decoding=\"async\" width=\"100%\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2021\/12\/Enem.jpg\" alt=\"CTA curso Enem\" title=\"CTA curso Enem\">\n        <\/a>\n\n\n\n\n\n<\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Veja-tambem\"><\/span>Veja tamb&eacute;m:<span class=\"ez-toc-section-end\"><\/span><\/h2><ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/fisica-enem\/\">O que mais cai em F&iacute;sica no Enem?<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/optica\/\">Como cai a &oacute;ptica no Enem<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/refracao\/\">Refra&ccedil;&atilde;o: f&oacute;rmulas, &acirc;ngulos, fen&ocirc;menos e mais<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/optica-geometrica\/\">&Oacute;ptica geom&eacute;trica: o que &eacute;, conceitos importantes, f&oacute;rmulas e quest&otilde;es<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/ondulatoria\/\">Como a Ondulat&oacute;ria cai no Enem<\/a>&nbsp;&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/eletricidade\/\">Eletricidade: conhe&ccedil;a as principais f&oacute;rmulas e conceitos<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/fisica\/lei-de-gauss-da-eletricidade\/\">A Lei de Gauss da Eletricidade: conceito e como cai na prova do ITA<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/lei-de-faraday-lenz\/\">Lei de Faraday-Lenz: defini&ccedil;&atilde;o, f&oacute;rmulas, aplica&ccedil;&otilde;es e exerc&iacute;cios<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/eletrodinamica\/\">Eletrodin&acirc;mica: o que &eacute;, conceitos, f&oacute;rmulas e aplica&ccedil;&otilde;es<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/inducao-eletromagnetica\/\">Indu&ccedil;&atilde;o eletromagn&eacute;tica: o que &eacute;, fluxo magn&eacute;tico, f&oacute;rmulas e aplica&ccedil;&otilde;es<\/a>&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/leis-de-ohm\/\">Leis de Ohm: primeira e segunda leis, f&oacute;rmulas, aplica&ccedil;&otilde;es e quest&otilde;es<\/a><\/li>\n<\/ul><\/p>\n","protected":false},"excerpt":{"rendered":"A atra&ccedil;&atilde;o magn&eacute;tica faz parte de muitas ferramentas presentes no cotidiano. A b&uacute;ssola, as portas de geladeira, os&hellip;\n","protected":false},"author":23,"featured_media":78136,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-54332","post","type-post","status-publish","format-standard","has-post-thumbnail","category-fisica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Magnetismo no Enem: conceitos, assuntos, f\u00f3rmulas e mais!<\/title>\n<meta name=\"description\" content=\"Encontre as principais informa\u00e7\u00f5es e caracter\u00edsticas sobre magnetismo no Enem: campo e for\u00e7a magn\u00e9ticos e indu\u00e7\u00e3o eletromagn\u00e9tica. 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