{"id":80805,"date":"2024-01-14T13:19:23","date_gmt":"2024-01-14T13:19:23","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/campo-magnetico-definicao-caracteristicas-e-uso\/"},"modified":"2024-01-20T10:06:02","modified_gmt":"2024-01-20T10:06:02","slug":"campo-magnetico-definicao-caracteristicas-e-uso","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/pt-br\/campo-magnetico-definicao-caracteristicas-e-uso\/","title":{"rendered":"Campo Magn\u00e9tico | Defini\u00e7\u00e3o, caracter\u00edsticas e uso"},"content":{"rendered":"<h2>O Campo Magn\u00e9tico<\/h2>\n<p>O campo magn\u00e9tico \u00e9 uma for\u00e7a invis\u00edvel gerada por correntes el\u00e9tricas e materiais magn\u00e9ticos. Ele influencia o comportamento de outras subst\u00e2ncias magn\u00e9ticas e cargas em movimento. Campos magn\u00e9ticos desempenham um papel crucial em fen\u00f4menos naturais, como o campo magn\u00e9tico da Terra, e em v\u00e1rias tecnologias, como motores, geradores e dispositivos de armazenamento de dados. O campo magn\u00e9tico \u00e9 frequentemente representado pelo s\u00edmbolo B e \u00e9 medido em unidades de Tesla (T) ou Gauss (G), onde 1 T = 10.000 G.<\/p>\n<h2>Mecanismos de Cria\u00e7\u00e3o de Campos Magn\u00e9ticos<\/h2>\n<p>Campos magn\u00e9ticos s\u00e3o criados atrav\u00e9s de dois mecanismos prim\u00e1rios: cargas el\u00e9tricas em movimento (correntes el\u00e9tricas) e as propriedades magn\u00e9ticas intr\u00ednsecas de certos materiais (como materiais ferromagn\u00e9ticos). Os campos magn\u00e9ticos n\u00e3o podem ser bloqueados, apenas redirecionados. Os materiais que redirecionam campos magn\u00e9ticos s\u00e3o materiais ferromagn\u00e9ticos (atra\u00eddos por \u00edm\u00e3s).<\/p>\n<h2>Campo Magn\u00e9tico: Um Campo Vetorial<\/h2>\n<p>Um campo magn\u00e9tico \u00e9 um campo vetorial que descreve a influ\u00eancia magn\u00e9tica de correntes el\u00e9tricas e materiais magn\u00e9ticos. \u00c9 uma for\u00e7a invis\u00edvel que rodeia \u00edm\u00e3s e correntes el\u00e9tricas, exercendo for\u00e7as sobre outros materiais magn\u00e9ticos e cargas em movimento. O comportamento dos campos magn\u00e9ticos \u00e9 descrito por um conjunto de equa\u00e7\u00f5es matem\u00e1ticas chamadas equa\u00e7\u00f5es de Maxwell, que tamb\u00e9m englobam os campos el\u00e9tricos.<\/p>\n<h2>Aplica\u00e7\u00f5es dos Campos Magn\u00e9ticos<\/h2>\n<p>Os campos magn\u00e9ticos t\u00eam in\u00fameras aplica\u00e7\u00f5es em diversos dom\u00ednios, incluindo ci\u00eancia, tecnologia, medicina e vida cotidiana. Algumas aplica\u00e7\u00f5es not\u00e1veis de campos magn\u00e9ticos incluem gera\u00e7\u00e3o de eletricidade, motores el\u00e9tricos, transformadores, dispositivos de armazenamento magn\u00e9tico e imagens de resson\u00e2ncia magn\u00e9tica (MRI).<\/p>\n<h2>Exemplos de Campos Magn\u00e9ticos<\/h2>\n<p>Aqui est\u00e3o quatro exemplos de campos magn\u00e9ticos e suas for\u00e7as aproximadas em Tesla (T):<\/p>\n<ul>\n<li>Campo magn\u00e9tico da Terra: aproximadamente 25 a 65 microteslas (\u00b5T).<\/li>\n<li>\u00cdm\u00e3 de geladeira: cerca de 0.001 T ou 1 millitesla (mT).<\/li>\n<li>M\u00e1quina de resson\u00e2ncia magn\u00e9tica (MRI): de 1.5 T a 3 T.<\/li>\n<li>\u00cdm\u00e3 de neod\u00edmio (NdFeB): at\u00e9 1.4 T ou mais.<\/li>\n<\/ul>\n<h2>Como Criar um Campo Magn\u00e9tico?<\/h2>\n<p>Campos magn\u00e9ticos s\u00e3o criados por cargas el\u00e9tricas em movimento (correntes el\u00e9tricas) e pelas propriedades magn\u00e9ticas intr\u00ednsecas de certos materiais (materiais ferromagn\u00e9ticos). Por exemplo, quando el\u00e9trons fluem atrav\u00e9s de um fio, formando uma corrente el\u00e9trica, um campo magn\u00e9tico \u00e9 gerado ao redor do fio. A regra da m\u00e3o direita pode ser usada para determinar a dire\u00e7\u00e3o do campo magn\u00e9tico em rela\u00e7\u00e3o \u00e0 dire\u00e7\u00e3o da corrente.<\/p>\n<h2>Como Blindar um Campo Magn\u00e9tico?<\/h2>\n<p>Campos magn\u00e9ticos n\u00e3o podem ser bloqueados, apenas redirecionados. O blindagem de um campo magn\u00e9tico envolve a cria\u00e7\u00e3o de uma barreira que impede ou reduz a penetra\u00e7\u00e3o do campo magn\u00e9tico em uma \u00e1rea espec\u00edfica. Materiais de blindagem magn\u00e9tica, como mu-metal ou ferro macio, atraem linhas de campo magn\u00e9tico, redirecionando-as efetivamente ao redor da \u00e1rea que precisa ser protegida.<\/p>\n<h2>Como Calcular um Campo Magn\u00e9tico?<\/h2>\n<p>V\u00e1rias leis e equa\u00e7\u00f5es s\u00e3o comumente usadas para c\u00e1lculos de campos magn\u00e9ticos, dependendo do contexto espec\u00edfico e das fontes do campo magn\u00e9tico. Algumas das leis e equa\u00e7\u00f5es mais importantes incluem:<\/p>\n<ul>\n<li>Lei de Biot-Savart: B = (\u03bc<sub>0<\/sub> \/ 4\u03c0) * \u222b(Idl \u00d7 r) \/ r<sup>3<\/sup><\/li>\n<li>Lei de Amp\u00e8re: \u222e B \u2022 dl = \u03bc<sub>0<\/sub> * I<sub>enclosed<\/sub><\/li>\n<li>Lei de Gauss para Magnetismo: \u222e B \u2022 dA = 0<\/li>\n<\/ul>\n<p>Essas leis e equa\u00e7\u00f5es, combinadas com as propriedades de materiais magn\u00e9ticos espec\u00edficos, podem ser usadas para calcular campos magn\u00e9ticos em v\u00e1rios cen\u00e1rios.<\/p>\n<h2>Pr\u00f3ximo Artigo<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.electricity-magnetism.org\/wp-content\/uploads\/2022\/01\/logo.png\" alt=\"\" \/><\/p>\n<div style=\"text-align: center; font-size: 20px;\">\n    <a href=\"https:\/\/www.electricity-magnetism.org\/magnetic-field\/\">Original Article<\/a>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Um campo magn\u00e9tico \u00e9 um campo vetorial que descreve a influ\u00eancia magn\u00e9tica de correntes el\u00e9tricas e materiais magn\u00e9ticos. \u00c9 uma for\u00e7a invis\u00edvel que envolve \u00edm\u00e3s e correntes el\u00e9tricas, exercendo for\u00e7as sobre outros materiais magn\u00e9ticos e movendo cargas.<\/p>\n","protected":false},"author":1,"featured_media":1581,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-80805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nao-categorizado","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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