{"id":88101,"date":"2023-03-01T16:00:00","date_gmt":"2023-03-01T19:00:00","guid":{"rendered":"https:\/\/vestibulares.estrategia.com\/portal\/?p=88101"},"modified":"2023-07-28T16:27:03","modified_gmt":"2023-07-28T19:27:03","slug":"campo-eletrico","status":"publish","type":"post","link":"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/campo-eletrico\/","title":{"rendered":"Campo el\u00e9trico: o que \u00e9, f\u00f3rmulas e quest\u00f5es"},"content":{"rendered":"<p class=\"wp-block-paragraph\">O <span id=\"urn:enhancement-73e2ee27-68aa-4458-8e3d-a21faac7a812\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> &eacute; um conceito f&iacute;sico vetorial utilizado para entender a influ&ecirc;ncia que uma carga geradora exerce sobre cargas que est&atilde;o ao seu redor. Isso pode ser mensurado por meio da <span id=\"urn:enhancement-671fb6d5-2598-4f59-99b3-4e91c3ca703c\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span>, que tamb&eacute;m &eacute; uma grandeza com intensidade, dire&ccedil;&atilde;o e sentido.&nbsp;<p class=\"wp-block-paragraph\">Acompanhe este resumo para saber mais sobre o <span id=\"urn:enhancement-ee3b0fe9-de4c-41ff-aa76-7bdf0ceda106\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span>, quais f&oacute;rmulas s&atilde;o determinadas para este assunto, qual a implica&ccedil;&atilde;o de um campo sobre as outras cargas e como utilizar essas informa&ccedil;&otilde;es para resolver quest&otilde;es de <span id=\"urn:enhancement-19a4b231-9aa5-4286-ae77-c4c54473cabc\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/vestibular\">vestibular<\/span>. Vamos l&aacute;?<\/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\/campo-eletrico\/#Conceito-de-campo-eletrico\" >Conceito de campo el&eacute;trico<\/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\/campo-eletrico\/#Formulas-de-campo-eletrico\" >F&oacute;rmulas de campo el&eacute;trico<\/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\/campo-eletrico\/#Relacao-entre-campo-e-forca-eletrica\" >Rela&ccedil;&atilde;o entre campo e for&ccedil;a el&eacute;trica<\/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\/campo-eletrico\/#Atracao-e-repulsao-entre-cargas\" >Atra&ccedil;&atilde;o e repuls&atilde;o entre cargas<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/campo-eletrico\/#Questoes-sobre-campo-eletrico\" >Quest&otilde;es sobre campo el&eacute;trico<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/campo-eletrico\/#Estude-para-o-vestibular-com-o-Estrategia\" >Estude para o vestibular com o Estrat&eacute;gia!<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"h-conceito-de-campo-eletrico\"><span class=\"ez-toc-section\" id=\"Conceito-de-campo-eletrico\"><\/span>Conceito de campo el&eacute;trico<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">De <span id=\"urn:enhancement-0f1f1f42-752d-47d8-afd3-87fedba8bae2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/geometria\">forma<\/span> simplificada, o <span id=\"urn:enhancement-9f4b764c-5019-4cad-8eff-53032d482da2\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> &eacute; o espa&ccedil;o em que as unidades de carga podem exercer influ&ecirc;ncia sobre outras cargas que adentrem aquele ambiente. Cada unidade de carga distribui essa grandeza vetorial em uma dire&ccedil;&atilde;o e sentido, por isso, ao considerarmos uma carga el&eacute;trica de dimens&otilde;es desprez&iacute;veis, adota-se que o <span id=\"urn:enhancement-2009b542-93b9-4668-a7b1-f80fe593b7c1\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> &eacute; tem uma dire&ccedil;&atilde;o e sentido radial (em todas as dire&ccedil;&otilde;es e sentidos, como raios de um c&iacute;rculo).<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/oUEFL8SntnpmZFP4cyZ26XIi5UKfp0d9IXNL1lWD6W048ehA_CR6_SW4JGDlCCJOCgaaLUmyVJsq0meozk29M_iiwmDW5YZ68041-9pN-qKGx8BynV21geOnKGE59WsTzfbD_nqPp9lX-0Ij8FJmors\" alt=\"Representa&ccedil;&atilde;o de campo el&eacute;trico\"><figcaption class=\"wp-element-caption\">Imagem: Reprodu&ccedil;&atilde;o\/Wikimedia<\/figcaption><\/figure>\n<\/div><p class=\"wp-block-paragraph\">Na figura, voc&ecirc; pode observar que cargas el&eacute;tricas positivas tem uma caracter&iacute;stica de campo de afastamento. Ou seja, suas setas apontam para fora, a partir do centro da carga. No caso da carga el&eacute;trica negativa, os vetores apontam para a regi&atilde;o interna, em dire&ccedil;&atilde;o ao centro da carga. Por fim, a &uacute;ltima representa&ccedil;&atilde;o indica uma carga neutra, que n&atilde;o &eacute; capaz de gerar <span id=\"urn:enhancement-afafb9cb-e106-4afc-b3b6-3c87031fd82a\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span>.&nbsp;<\/p><h2 class=\"wp-block-heading\" id=\"h-formulas-de-campo-eletrico\"><span class=\"ez-toc-section\" id=\"Formulas-de-campo-eletrico\"><\/span>F&oacute;rmulas de campo el&eacute;trico<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Para calcular um <a href=\"https:\/\/www.youtube.com\/watch?v=W0nWsysfmG0\" target=\"_blank\">campo el&eacute;trico<\/a>, leva-se em considera&ccedil;&atilde;o a intensidade da carga em quest&atilde;o. Afinal, quanto maior for esse valor, maior ser&aacute; a influ&ecirc;ncia sobre o meio. Al&eacute;m disso, a dist&acirc;ncia entre o ponto observado e a carga el&eacute;trica tamb&eacute;m devem ser consideradas, porque quanto mais longe da carga, menos ela consegue interferir no sistema. A partir dessas informa&ccedil;&otilde;es foi criada a f&oacute;rmula:<\/p><p class=\"has-text-align-center wp-block-paragraph\">&#274; = k<sub>o<\/sub>.Q\/ d<sup>2<\/sup><\/p><p class=\"wp-block-paragraph\">&#274;: m&oacute;dulo do <span id=\"urn:enhancement-1c42549e-ab6f-480c-9fc0-232212a01ddd\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span>, em V\/m ou N\/<span id=\"urn:enhancement-c949fbcc-de1a-4418-934c-27c701f73c10\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><\/p><p class=\"wp-block-paragraph\">k<sub>o <\/sub>= constante eletrost&aacute;tica no v&aacute;cuo = 8,99.10<sup>9<\/sup> N.m&sup2;\/<span id=\"urn:enhancement-a0ed70c8-2693-499e-bc42-6bcff02112c5\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>&sup2;<\/p><p class=\"wp-block-paragraph\">Q = intensidade da carga pontual em quest&atilde;o, medida em <span id=\"urn:enhancement-bdb2cdf7-b444-44fb-ac10-0543a7317459\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><\/p><p class=\"wp-block-paragraph\">d = dist&acirc;ncia entre o centro da carga e o ponto observado, em metros<\/p><p class=\"wp-block-paragraph\">Por exemplo, no caso de uma carga que tenha uma intensidade de 20 <span id=\"urn:enhancement-7528793a-6558-4e73-87be-f3190377b518\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>, o <span id=\"urn:enhancement-1ce69e3c-bd59-4935-8542-14561638445b\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> a uma dist&acirc;ncia de 2 metros seria?<\/p><p class=\"has-text-align-center wp-block-paragraph\">&#274; = k<sub>o<\/sub>.Q\/ d<sup>2<\/sup><\/p><p class=\"wp-block-paragraph\">&#274; = 8,99.10<sup>9<\/sup>.20\/4<\/p><p class=\"wp-block-paragraph\">&#274; = 8,99.10<sup>9<\/sup>.5<\/p><p class=\"wp-block-paragraph\">&#274; = 44,95.10<sup>9<\/sup> N\/<span id=\"urn:enhancement-0e479bee-9066-47f4-973d-924141bd9cdd\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span><\/p><h2 class=\"wp-block-heading\" id=\"h-relacao-entre-campo-e-forca-eletrica\"><span class=\"ez-toc-section\" id=\"Relacao-entre-campo-e-forca-eletrica\"><\/span>Rela&ccedil;&atilde;o entre campo e for&ccedil;a el&eacute;trica<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">A <span id=\"urn:enhancement-7cd60a0e-eef1-47d5-869a-39257b48b674\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span> &eacute; gerada em um ambiente no qual atua um <span id=\"urn:enhancement-4db3feb6-4ea8-4c95-8edc-c4b52350e564\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span>. Nesse caso, &eacute; necess&aacute;ria a presen&ccedil;a de pelo menos duas cargas el&eacute;tricas, que v&atilde;o interagir entre si, seja para repelir ou para atrair uma a outra.<\/p><p class=\"wp-block-paragraph\">Em termos gerais, os vetores de <span id=\"urn:enhancement-923c8b71-0edb-4391-bc17-a51c2584ddcb\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> geram uma resultante e essa &eacute; a dire&ccedil;&atilde;o e sentido da <span id=\"urn:enhancement-7f6e91ad-123e-46bc-a24d-4796bee699b1\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span>. Nos casos em que a resultante dos vetores seja um valor nulo, observa-se que n&atilde;o existir&aacute; <span id=\"urn:enhancement-069454a2-89d4-44e3-bb3d-3e6b9f8e5409\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span>, porque a intera&ccedil;&atilde;o anula o efeito tanto de uma carga, como da outra.<\/p><p class=\"wp-block-paragraph\">Considere que, em um meio, existe a carga gerada de <span id=\"urn:enhancement-61d6a3eb-e4fe-4ce2-b046-c43d0c133870\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> Q, que vai interagir com uma outra carga el&eacute;trica q, tamb&eacute;m chamada de carga de prova. A <span id=\"urn:enhancement-0a56a84a-06e3-46de-a063-c881edbd9fb8\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span> que traduz a intensidade de <span id=\"urn:enhancement-e5c7167d-2fa3-467b-af74-bf425da99718\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> nesse ponto &eacute;:<\/p><p class=\"has-text-align-center wp-block-paragraph\">&#274; = F\/q<\/p><p class=\"wp-block-paragraph\">&#274;: <span id=\"urn:enhancement-68ed143c-048a-4274-aeae-13b8ef273e39\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span>, em N\/<span id=\"urn:enhancement-0207454e-b1e6-41cf-b0f7-8ad7f3cba023\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span> ou V\/m<\/p><p class=\"wp-block-paragraph\">F: <span id=\"urn:enhancement-d23b9dc5-cb2f-4ff1-8ce8-78bd9c7159d7\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span>, medida em newtons (N)<\/p><p class=\"wp-block-paragraph\">q: carga el&eacute;trica de prova, em coulomb (<span id=\"urn:enhancement-1e60984c-b354-42a0-9d42-cd091f98b5d2\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>)<\/p><p class=\"wp-block-paragraph\">Essa mesma f&oacute;rmula pode ser utilizada para encontrar o valor da <span id=\"urn:enhancement-f8d75571-4e4b-44fe-b874-5367abac40a7\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span>, basta alterar a configura&ccedil;&atilde;o da <span id=\"urn:enhancement-4b991559-b44b-4647-8302-a513e553d750\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/equacao\">equa&ccedil;&atilde;o<\/span>. Perceba que a intensidade do <span id=\"urn:enhancement-3529d413-3437-4090-abe2-3f61b93896eb\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> e da carga el&eacute;trica determinam a intensidade da <span id=\"urn:enhancement-ed55e9be-db46-4b51-afdf-99524e31eafc\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span> exercida naquela regi&atilde;o.&nbsp;<\/p><p class=\"wp-block-paragraph\">Vamos considerar que, no v&aacute;cuo, para a mesma carga Q de intensidade 20 <span id=\"urn:enhancement-6d129edb-02f1-405d-bf28-7efe79f1856d\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>, a uma dist&acirc;ncia de 1m, est&aacute; uma carga de prova com q = 5 <span id=\"urn:enhancement-6dfa150b-14d1-4de8-92b6-ce280e8b34e0\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>. Qual seria a <span id=\"urn:enhancement-7fd4443f-e6b4-4a42-becd-a2ba55993055\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span> nesse ponto?<\/p><p class=\"wp-block-paragraph\">Primeiramente, &eacute; necess&aacute;rio descobrir qual a intensidade do <span id=\"urn:enhancement-560ac11c-ab23-470d-821c-f39e82551527\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> no ponto em quest&atilde;o:<\/p><p class=\"has-text-align-center wp-block-paragraph\">&#274; = k<sub>o<\/sub>.Q\/ d<sup>2<\/sup><\/p><p class=\"wp-block-paragraph\">&#274; = 8,99.10<sup>9<\/sup>.20\/1<\/p><p class=\"wp-block-paragraph\">&#274; = 8,99.10<sup>9<\/sup>.20<\/p><p class=\"wp-block-paragraph\">&#274; = 1,798.10<sup>11<\/sup><\/p><p class=\"wp-block-paragraph\">Agora, utilizamos essa informa&ccedil;&atilde;o para mensurar a <span id=\"urn:enhancement-c927d53b-0f98-4444-bffb-839768d17c29\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span>, com a segunda f&oacute;rmula fornecida:<\/p><p class=\"has-text-align-center wp-block-paragraph\">&#274; = F\/q<\/p><p class=\"wp-block-paragraph\">1,798.10<sup>11<\/sup> = F\/5<\/p><p class=\"wp-block-paragraph\">1,798.10<sup>11<\/sup>.5 = F<\/p><p class=\"wp-block-paragraph\">8,99.10<sup>11<\/sup> = F<\/p><h2 class=\"wp-block-heading\" id=\"h-atracao-e-repulsao-entre-cargas\"><span class=\"ez-toc-section\" id=\"Atracao-e-repulsao-entre-cargas\"><\/span>Atra&ccedil;&atilde;o e repuls&atilde;o entre cargas<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Os <span id=\"urn:enhancement-b516a0db-08f6-49cc-849e-9c7a26f347a9\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campos el&eacute;tricos<\/span> se comportam de maneiras diferentes, a depender do tipo de carga adicionada em quest&atilde;o. Esse comportamento pode ser resumido com a frase &ldquo;iguais se repelem, diferente se atraem&rdquo;.&nbsp;<\/p><p class=\"wp-block-paragraph\">Assim, quando duas cargas el&eacute;tricas positivas s&atilde;o colocadas pr&oacute;ximas, as duas possuem um campo radial com sentido para fora. Na intera&ccedil;&atilde;o, por terem cargas de mesmo sinal, os vetores de for&ccedil;a afastam-se um dos outros.<\/p><p class=\"wp-block-paragraph\">O mesmo acontece quando duas cargas negativas est&atilde;o no mesmo ambiente e seus vetores radiais para dentro se repelem, como voc&ecirc; observar nas imagens a seguir. Note que os tra&ccedil;ados em preto tamb&eacute;m podem ser chamados de linhas de for&ccedil;a, e o <span id=\"urn:enhancement-a5cab131-3a65-486c-b1b3-b0d3488ac316\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> &eacute; uma grandeza <span id=\"urn:enhancement-75a13352-3772-47c8-aeb7-ce49908147c3\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/tangente\">tangente<\/span> a essas linhas.<\/p><div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/lh5.googleusercontent.com\/Z_woYIj6bT4e8XF9WeECCjjQds7mV6NRwcHnkY7rleGDkIYG4Xm5kqzAyjr_OgcsHNjFhV5UElXQ3HFT5Z0MpZSuk0mzDxlOpZ6AM6vENPQKwkBfDQzrFotq564WRMofsKwMv0x0MBD-1Nmn_rbVZC0\" alt=\"\" width=\"285\" height=\"214\"><figcaption class=\"wp-element-caption\">Repuls&atilde;o entre cargas de mesmo sinal<br>Imagem: Reprodu&ccedil;&atilde;o\/Wikimedia<\/figcaption><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/lh6.googleusercontent.com\/zUwbGAx1WFj0HPrD1kze394WMrdkWYZafcDtSuGOncjH_y0o1ycDYODYbc-Lz9-0L2lGTM5ypYz-xu5bp9VPkeBhHMJm9IBS-YegPtFdboNDJaajOxvfDrkaTa4COEcRMN7Xf_RRO5v4shS3s55jyDI\" alt=\"\" width=\"286\" height=\"215\"><figcaption class=\"wp-element-caption\">Repuls&atilde;o entre cargas de mesmo sinal<br>Imagem: Reprodu&ccedil;&atilde;o\/Wikimedia<\/figcaption><\/figure>\n<\/div><\/div><\/div><p class=\"wp-block-paragraph\">Ao mesmo tempo, a intera&ccedil;&atilde;o entre duas cargas de sinais opostos induz uma atra&ccedil;&atilde;o m&uacute;tua entre as duas entidades f&iacute;sicas. Em termos vetoriais, &eacute; como se um vetor fosse de encontro ao outro, formando linhas cont&iacute;nuas, como est&aacute; representado a seguir.<\/p><figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"640\" height=\"480\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2023\/02\/image-3.png\" alt=\"\" class=\"wp-image-88103\"><figcaption class=\"wp-element-caption\">Atra&ccedil;&atilde;o entre cargas de sinal diferentes<br>Imagem: Reprodu&ccedil;&atilde;o\/Wikimedia<\/figcaption><\/figure><p class=\"wp-block-paragraph\">+ Veja tamb&eacute;m: <a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/eletrodinamica\/\" target=\"_blank\">Eletrodin&acirc;mica: o que &eacute;, conceitos, f&oacute;rmulas e aplica&ccedil;&otilde;es<\/a><\/p><p class=\"wp-block-paragraph\"><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/processos-de-eletrizacao\/\" target=\"_blank\">Processos de eletriza&ccedil;&atilde;o na F&iacute;sica: defini&ccedil;&atilde;o, cargas, tipos e mais<\/a><\/p><p class=\"wp-block-paragraph\"><a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/eletricidade\/\" target=\"_blank\">Eletricidade: conhe&ccedil;a as principais f&oacute;rmulas e conceitos<\/a><\/p><h2 class=\"wp-block-heading\" id=\"h-questoes-sobre-campo-eletrico\"><span class=\"ez-toc-section\" id=\"Questoes-sobre-campo-eletrico\"><\/span>Quest&otilde;es sobre campo el&eacute;trico<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">(FATEC-SP\/Adaptada) Em um ponto P do espa&ccedil;o existe um <span id=\"urn:enhancement-92d63bda-564d-48c6-ab78-70086f642676\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/campos-eletricos\">campo el&eacute;trico<\/span> E horizontal de<\/p><p class=\"wp-block-paragraph\">intensidade E = 5.10<sup>4<\/sup>N\/<span id=\"urn:enhancement-69c1ced9-f6c3-444c-87ed-ad866fd473e6\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>, voltado para a direita.<\/p><p class=\"wp-block-paragraph\">a) Se uma carga de prova de 1,5&mu;<span id=\"urn:enhancement-1a32a9be-0473-452d-9454-f2e145e8f7ae\" class=\"textannotation disambiguated wl-creative-work\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/celsius\">C<\/span>, positiva, &eacute; colocada em P, qual ser&aacute; o valor da <span id=\"urn:enhancement-5b25bfb1-8d50-42ca-89c2-743cedbb75ba\" class=\"textannotation disambiguated wl-thing\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/forca-eletrica-2\">for&ccedil;a el&eacute;trica<\/span> que atua sobre ela?<\/p><p class=\"wp-block-paragraph\">Podemos utilizar a f&oacute;rmula de for&ccedil;a, uma vez que todas as informa&ccedil;&otilde;es a respeito de intensidade e carga j&aacute; foram anotadas. &Eacute; importante tamb&eacute;m lembrar das<a href=\"https:\/\/vestibulares.estrategia.com\/portal\/materias\/fisica\/ordem-de-grandeza\/\"> ordens de grandeza<\/a>, para substituir &mu; (micro) pelo valor correto (10<sup>-6<\/sup>).<\/p><p class=\"has-text-align-center wp-block-paragraph\">&#274; = F\/q<\/p><p class=\"wp-block-paragraph\">&#274;.q = F<\/p><p class=\"wp-block-paragraph\">5.10<sup>4<\/sup>.1,5.10<sup>-6<\/sup> = F<\/p><p class=\"wp-block-paragraph\">7,5.10<sup>-2 <\/sup>N = F<\/p><h2 class=\"wp-block-heading\" id=\"h-estude-para-o-vestibular-com-o-estrategia\"><span class=\"ez-toc-section\" id=\"Estude-para-o-vestibular-com-o-Estrategia\"><\/span>Estude para o vestibular com o Estrat&eacute;gia!<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"wp-block-paragraph\">Conhe&ccedil;a o material do <span id=\"urn:enhancement-973a8ea0-adf2-4214-bd47-f4066b724fbb\" class=\"textannotation disambiguated wl-organization\" itemid=\"https:\/\/data.wordlift.io\/wl110249\/entity\/estrategia_vestibulares\">Estrat&eacute;gia Vestibulares<\/span>, al&eacute;m de toda a base te&oacute;rica, a Coruja disponibiliza videoaulas com resolu&ccedil;&atilde;o de exerc&iacute;cios, f&oacute;runs de d&uacute;vidas e um livro interativo em que voc&ecirc; pode fazer coment&aacute;rios e anota&ccedil;&otilde;es, que ficar&atilde;o salvos e te ajudar&atilde;o na revis&atilde;o do conte&uacute;do. Com essas ferramentas, voc&ecirc; fica cada vez mais pr&oacute;ximo da sua aprova&ccedil;&atilde;o! Clique no banner e saiba mais.<\/p><p class=\"wp-block-paragraph\"><a id=\"cta\" class=\"cta-imagem\" href=\"https:\/\/vestibulares.estrategia.com\/cursos\/\" target=\"blank\">\n                <img decoding=\"async\" width=\"100%\" src=\"https:\/\/vestibulares.estrategia.com\/portal\/wp-content\/uploads\/2022\/08\/pacotes-intensivos-cta.jpeg\" alt=\"pacotes-intensivos-cta\" title=\"pacotes-intensivos-cta\">\n        <\/a>\n\n\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"O campo el&eacute;trico &eacute; um conceito f&iacute;sico vetorial utilizado para entender a influ&ecirc;ncia que uma carga geradora exerce&hellip;\n","protected":false},"author":23,"featured_media":88073,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-88101","post","type-post","status-publish","format-standard","has-post-thumbnail","category-fisica"],"acf":[],"yoast_head":"<!-- This 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