{"id":16764,"date":"2023-09-14T03:46:48","date_gmt":"2023-09-14T03:46:48","guid":{"rendered":"https:\/\/bemagnet.com\/?p=16764"},"modified":"2023-09-18T02:12:32","modified_gmt":"2023-09-18T02:12:32","slug":"o-que-e-gauss","status":"publish","type":"post","link":"https:\/\/bemagnet.com\/pt\/what-is-gauss\/","title":{"rendered":"O que \u00e9 Gauss - Aprenda os conceitos b\u00e1sicos e a import\u00e2ncia de Gauss no Magnetismo"},"content":{"rendered":"<p>O Gauss mede a intensidade do campo magn\u00e9tico, tamb\u00e9m conhecido como densidade de fluxo, normalmente num determinado ponto. O Gauss era parte integrante do sistema de unidades cent\u00edmetro-grama-segundo (cgs). No entanto, foi substitu\u00eddo pelo tesla (T) no moderno sistema de unidades SI (Sistema Internacional).<\/p>\n<h2>Convers\u00e3o de unidades<\/h2>\n<figure id=\"attachment_16765\" aria-describedby=\"caption-attachment-16765\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16765\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/09\/Figure-1.Magnetic-Field-Strength.jpg\" alt=\"Intensidade do campo magn\u00e9tico\" width=\"600\" height=\"350\" \/><figcaption id=\"caption-attachment-16765\" class=\"wp-caption-text\">Intensidade do campo magn\u00e9tico<\/figcaption><\/figure>\n<p>\u00c9 poss\u00edvel exprimir a intensidade do campo magn\u00e9tico noutras unidades que n\u00e3o Gauss, dadas as seguintes rela\u00e7\u00f5es:<\/p>\n<p>1 Gauss (G) = 1 Mx\/cm\u00b2<\/p>\n<p>1 Gauss (G) = 10<sup>-4<\/sup> Tesla (T)<\/p>\n<p>1 Gauss (G) = 10<sup>3<\/sup> miliGauss (mG)<\/p>\n<p>1 Gauss (G) = 10<sup>4<\/sup> microGauss (\u00b5G)<\/p>\n<p>1 Gauss (G) = 10<sup>6<\/sup> nanoGauss (nG)<\/p>\n<p>1 Gauss (G) = 10<sup>-2<\/sup> oersted (Oe)<\/p>\n<h2>Factores que influenciam o valor de Gauss<\/h2>\n<p>V\u00e1rios factores podem influenciar o valor de Gauss dentro de um <a href=\"https:\/\/www.sciencedirect.com\/topics\/engineering\/magnetic-fields\">campo magn\u00e9tico<\/a> ou num determinado local. A compreens\u00e3o destes factores permite-lhe interpretar e manipular adequadamente a intensidade do campo magn\u00e9tico para v\u00e1rias aplica\u00e7\u00f5es.<\/p>\n<p><strong>i. Fluxo de corrente:<\/strong> Para electro\u00edmanes num circuito com fluxo de corrente, o valor de Gauss depende da intensidade da corrente do condutor. Quanto maior for a corrente conduzida, mais forte ser\u00e1 o campo magn\u00e9tico.<\/p>\n<p><strong>ii. Dist\u00e2ncia da fonte:<\/strong> A intensidade do campo magn\u00e9tico reduz-se de forma inversamente proporcional ao quadrado da dist\u00e2ncia. Assim, se duplicarmos a dist\u00e2ncia de uma fonte magn\u00e9tica, o resultado ser\u00e1 uma redu\u00e7\u00e3o do valor de Gauss. Normalmente, o valor reduz-se para cerca de 4<sup>th<\/sup> da for\u00e7a original.<\/p>\n<p><strong>iii. Material:<\/strong> A intensidade do campo magn\u00e9tico varia consoante o <a href=\"https:\/\/bemagnet.com\/pt\/materiais-magneticos\/\">tipo de materiais magn\u00e9ticos<\/a>.<\/p>\n<p><strong>iv. Interfer\u00eancia:<\/strong> Quando um campo externo afecta o campo magn\u00e9tico, nota-se um desvio no valor de Gauss.<\/p>\n<p><strong>v. Fonte magn\u00e9tica:<\/strong> Quando existe uma fonte magn\u00e9tica mais forte, \u00e9 de esperar que os valores de Gauss sejam mais elevados.<\/p>\n<p><strong>vi. Factores ambientais:<\/strong> Certas vari\u00e1veis ambientais, como a press\u00e3o e a temperatura, podem afetar as propriedades magn\u00e9ticas. Consequentemente, \u00e9 de esperar que o valor de Gauss se altere.<\/p>\n<p><strong>vii. Histerese:<\/strong> A histerese afectar\u00e1 os materiais ferromagn\u00e9ticos. Consequentemente, verificar-se-\u00e1 uma altera\u00e7\u00e3o nas leituras de Gauss.<\/p>\n<h2>Import\u00e2ncia da medi\u00e7\u00e3o de Gauss<\/h2>\n<p>H\u00e1 muitas formas de utilizar estes valores nas aplica\u00e7\u00f5es modernas:<\/p>\n<p>i. Rastreio do campo magn\u00e9tico, seja ele de fundo ou de uma fonte, que possa causar interfer\u00eancias electromagn\u00e9ticas.<\/p>\n<p>ii. Determina\u00e7\u00e3o da intensidade de um campo magn\u00e9tico de um equipamento eletr\u00f3nico.<\/p>\n<p>iii. Ajudam no estudo do campo magn\u00e9tico da Terra.<\/p>\n<p>iv. \u00c9 poss\u00edvel avaliar a for\u00e7a de diferentes materiais magn\u00e9ticos.<\/p>\n<p>v. As medi\u00e7\u00f5es de Gauss s\u00e3o utilizadas pelas m\u00e1quinas de resson\u00e2ncia magn\u00e9tica para controlar a intensidade dos campos magn\u00e9ticos produzidos durante os procedimentos de imagiologia.<\/p>\n<p>vi. Ao projetar blindagens magn\u00e9ticas para utiliza\u00e7\u00e3o contra campos magn\u00e9ticos externos, as medi\u00e7\u00f5es de Gauss ajudam a avaliar a sua efic\u00e1cia.<\/p>\n<h2>Valores de Gauss not\u00e1veis<\/h2>\n<p>Os valores de Gauss variam muito, com os seguintes valores not\u00e1veis:<\/p>\n<ul>\n<li>O valor de Gauss de um \u00edman de frigor\u00edfico b\u00e1sico \u00e9 50G, enquanto um \u00edman de ferro mede 100G.<\/li>\n<li>Uma m\u00e1quina de resson\u00e2ncia magn\u00e9tica utilizada para imagiologia m\u00e9dica pode ter for\u00e7as de campo magn\u00e9tico entre 3000-70000 G.<\/li>\n<li>As ligas de ferro utilizadas nos transformadores t\u00eam uma satura\u00e7\u00e3o de permeabilidade elevada que varia entre 16000 e 22000G.<\/li>\n<li>A intensidade do campo magn\u00e9tico da Terra \u00e0 sua superf\u00edcie varia tipicamente entre 0,25-0,60 G, dependendo da localiza\u00e7\u00e3o e de factores geol\u00f3gicos.<\/li>\n<li>O Grande Colisor de H\u00e1drons funciona com campos magn\u00e9ticos de at\u00e9 83.300 Gauss.<\/li>\n<li>A reman\u00eancia dos \u00edmanes de neod\u00edmio pode variar entre 10.000 G e mais de 20.000 Gauss.<\/li>\n<\/ul>\n<h2>Gauss Vs Tesla<\/h2>\n<p>Tanto Gauss como <a href=\"https:\/\/en.wikipedia.org\/wiki\/Tesla_(unit)\">Tesla<\/a> s\u00e3o unidades de medida da intensidade do campo magn\u00e9tico, tendo a \u00faltima substitu\u00eddo a primeira como unidade SI. O Gauss pode ser representado como Maxwell por cent\u00edmetro quadrado e o Tesla como Newton por ampere-metro.<\/p>\n<p>Quando se trata do sistema internacional de unidades, o Tesla \u00e9 a unidade padr\u00e3o para medir a intensidade do campo magn\u00e9tico em vez do Gauss. Como \u00e9 uma unidade maior em compara\u00e7\u00e3o com o Gauss, \u00e9 mais pr\u00e1tica na descri\u00e7\u00e3o e medi\u00e7\u00e3o de campos magn\u00e9ticos numa vasta gama de aplica\u00e7\u00f5es.<\/p>\n<h2>Como se mede a for\u00e7a de Gauss<\/h2>\n<p>Existem diferentes instrumentos capazes de medir a intensidade de Gauss. O m\u00e9todo de medi\u00e7\u00e3o depende da intensidade e da frequ\u00eancia do campo magn\u00e9tico e tamb\u00e9m da aplica\u00e7\u00e3o. As fontes de interfer\u00eancia podem afetar a precis\u00e3o da medi\u00e7\u00e3o da intensidade de Gauss, pelo que deve ser considerada a sensibilidade do instrumento de medi\u00e7\u00e3o.<\/p>\n<p>Alguns dos m\u00e9todos comuns utilizados na medi\u00e7\u00e3o da for\u00e7a de Gauss incluem:<\/p>\n<p><strong>\u00a0 i<\/strong>. <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hall_effect\"><strong>Sensores de efeito Hall<\/strong><\/a><strong>:<\/strong> Trata-se de dispositivos de sil\u00edcio que podem medir a intensidade de um campo magn\u00e9tico produzindo uma tens\u00e3o proporcional \u00e0 intensidade do campo.<\/p>\n<figure id=\"attachment_16766\" aria-describedby=\"caption-attachment-16766\" style=\"width: 500px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16766\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/09\/Figure-2.-Hall-Effect-Sensor.jpg\" alt=\" Sensor de efeito Hall\" width=\"500\" height=\"350\" \/><figcaption id=\"caption-attachment-16766\" class=\"wp-caption-text\">Sensor de efeito Hall<\/figcaption><\/figure>\n<p><strong>\u00a0 \u00a0 \u00a0 \u00a0 ii. Magnet\u00f3metros:<\/strong> Estes instrumentos s\u00e3o especificamente concebidos para medir campos magn\u00e9ticos, existindo v\u00e1rios tipos dispon\u00edveis com diferentes gamas de medi\u00e7\u00e3o e sensibilidade.<\/p>\n<figure id=\"attachment_16767\" aria-describedby=\"caption-attachment-16767\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16767\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/09\/Figure-3.-Magnetometer.jpg\" alt=\" Magnet\u00f3metro\" width=\"300\" height=\"600\" \/><figcaption id=\"caption-attachment-16767\" class=\"wp-caption-text\">Magnet\u00f3metro<\/figcaption><\/figure>\n<p><strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0iii. Sonda de Hall:<\/strong> \u00c9 um sensor especializado altamente sens\u00edvel a campos magn\u00e9ticos que proporciona uma forma eficiente de medir a intensidade do campo magn\u00e9tico.<\/p>\n<figure id=\"attachment_16768\" aria-describedby=\"caption-attachment-16768\" style=\"width: 550px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-16768 size-full\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/09\/Figure-4.Hall-Probe.jpg\" alt=\"Sonda Hall\" width=\"550\" height=\"300\" \/><figcaption id=\"caption-attachment-16768\" class=\"wp-caption-text\">Sonda Hall<\/figcaption><\/figure>\n<p><strong>\u00a0 \u00a0 \u00a0 \u00a0iv. Dispositivos de interfer\u00eancia qu\u00e2ntica supercondutores:<\/strong> Como detectores muito sens\u00edveis, os SQUIDs s\u00e3o utilizados para medir campos magn\u00e9ticos muito fracos.<\/p>\n<figure id=\"attachment_16769\" aria-describedby=\"caption-attachment-16769\" style=\"width: 450px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16769\" src=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/09\/Figure5.-Squid-Sensor.jpg\" alt=\"Sensor de lulas\" width=\"450\" height=\"450\" srcset=\"https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/09\/Figure5.-Squid-Sensor.jpg 450w, https:\/\/bemagnet.com\/wp-content\/uploads\/2023\/09\/Figure5.-Squid-Sensor-150x150.jpg 150w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><figcaption id=\"caption-attachment-16769\" class=\"wp-caption-text\">Sensor de lulas<\/figcaption><\/figure>\n<h2>Medidor de Gauss<\/h2>\n<p>Para al\u00e9m da for\u00e7a, um medidor de Gauss tamb\u00e9m mede a dire\u00e7\u00e3o do campo magn\u00e9tico. Pode ser utilizado em aplica\u00e7\u00f5es como a avalia\u00e7\u00e3o de interfer\u00eancias electromagn\u00e9ticas, o ensaio de \u00edmanes, o mapeamento de campos magn\u00e9ticos e a an\u00e1lise de materiais magn\u00e9ticos.<\/p>\n<p>Segue-se um resumo das principais carater\u00edsticas e fun\u00e7\u00f5es de um medidor de Gauss:<\/p>\n<ul>\n<li>Os medidores de Gauss fornecem medi\u00e7\u00f5es exactas da intensidade do campo magn\u00e9tico em unidades de Gauss (G) ou Tesla (T).<\/li>\n<li>Capaz de fornecer uma gama de campos magn\u00e9ticos de fracos a fortes com base nos seus valores obtidos.<\/li>\n<li>Um sensor permite que o medidor de Gauss detecte a presen\u00e7a de um campo magn\u00e9tico.<\/li>\n<li>Um ecr\u00e3 no medidor de Gauss mostra a leitura da intensidade do campo magn\u00e9tico obtida.<\/li>\n<li>O medidor de Gauss pode detetar ligeiras altera\u00e7\u00f5es na intensidade de um campo magn\u00e9tico durante a medi\u00e7\u00e3o.<\/li>\n<\/ul>\n<h2>\u00a0Conclus\u00e3o<\/h2>\n<p>Apesar de ser cada vez menos utilizado nos tempos modernos, o Gauss continua a ser uma forma fi\u00e1vel de medir intensidades de campos magn\u00e9ticos especialmente baixos. A compreens\u00e3o do gauss pode tamb\u00e9m ajud\u00e1-lo a interpretar corretamente a literatura antiga quando faz investiga\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>Gauss measures magnetic field strength otherwise known as flux density, usually at a particular point. The Gauss was an integral part of the centimeter-gram-second (cgs) system of units. It was however replaced by the tesla (T) in the modern SI (International System) of Units. Unit Conversion You can express magnetic field strength in other units [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16770,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-16764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is Gauss \u2013 Learn the Basics &amp; Importance of Gauss in Magnetism<\/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:\/\/bemagnet.com\/pt\/o-que-e-gauss\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is Gauss \u2013 Learn the Basics &amp; Importance of Gauss in Magnetism\" \/>\n<meta property=\"og:description\" content=\"Gauss measures magnetic field strength otherwise known as flux density, usually at a particular point. 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