{"id":26207,"date":"2020-10-13T08:58:12","date_gmt":"2020-10-13T11:58:12","guid":{"rendered":"https:\/\/www.ufrgs.br\/amlef\/?post_type=tnc_col_21662_item&#038;p=26207"},"modified":"2020-10-13T09:55:34","modified_gmt":"2020-10-13T12:55:34","slug":"bobina","status":"publish","type":"tnc_col_21662_item","link":"https:\/\/www.ufrgs.br\/amlef\/glossario\/bobina\/","title":{"rendered":"Bobina"},"content":{"rendered":"<p>Bobina \u00e9 o enro\u00adla\u00admento de um fio, nor\u00admal\u00admente tem formato de anel, caracol ou espiral. \u00c9 um ins\u00adtru\u00admento muito impor\u00adtante na ele\u00adtr\u00f4\u00adnica, pos\u00adsi\u00adbi\u00adli\u00adtando a cria\u00e7\u00e3o de campos mag\u00adn\u00e9\u00adti\u00adcos a partir da pas\u00adsa\u00adgem de cor\u00adrente el\u00e9\u00adtrica pelo fio (um fen\u00f4\u00admeno expli\u00adcado pela Lei de Biot-Savart). A cons\u00adtru\u00ad\u00e7\u00e3o da bobina \u00e9 deter\u00admi\u00adnante para as carac\u00adte\u00adr\u00eds\u00adti\u00adcas do campo mag\u00adn\u00e9\u00adtico gerado, assim, uma bobina com um formato dife\u00adrente ou mais voltas enro\u00adla\u00addas gera um campo mag\u00adn\u00e9\u00adtico dife\u00adrente de alguma outra bobina ainda que ambas sejam per\u00adcor\u00adri\u00addas pela mesma cor\u00adrente el\u00e9\u00adtrica. Uma das van\u00adta\u00adgens de se usar bobinas \u00e9 o fato de que \u00e9 pos\u00ads\u00ed\u00advel inten\u00adsi\u00adfi\u00adcar a mag\u00adni\u00adtude do campo mag\u00adn\u00e9\u00adtico, uma vez que os campos mag\u00adn\u00e9\u00adti\u00adcos pro\u00addu\u00adzi\u00addos ir\u00e3o se sobre\u00adpor e se somar no centro da bobina. Dessa forma, quanto mais voltas o fio da bobina tiver, maior ser\u00e1 o campo mag\u00adn\u00e9\u00adtico pro\u00addu\u00adzido por ela. Podemos deter\u00admi\u00adnar a dire\u00e7\u00e3o do campo mag\u00adn\u00e9\u00adtico em uma bobina atrav\u00e9s da Regra da M\u00e3o Direita. Vale sali\u00aden\u00adtar que, se a bobina for per\u00adcor\u00adrida por cor\u00adrente con\u00adt\u00ed\u00adnua, ela ir\u00e1 se com\u00adpor\u00adtar como um curto-cir\u00adcuito e nenhum campo mag\u00adn\u00e9\u00adtico ser\u00e1 gerado nela.<br>\n\u00c9 inte\u00adres\u00adsante saber tamb\u00e9m que existem in\u00fa\u00adme\u00adros tipos dife\u00adren\u00adtes de bobina, tais&nbsp;como:<\/p>\n<p>-N\u00facleo fer\u00adro\u00admag\u00adn\u00e9\u00adtico: aumenta a indu\u00adt\u00e2n\u00adcia da bobina; contudo, garante muitas perdas;<\/p>\n<p>-N\u00facleo lami\u00adnado: formado por camadas de a\u00e7o-sil\u00edcio enver\u00adni\u00adza\u00addas. \u00c9 ideal para ser uti\u00adli\u00adzado em trans\u00adfor\u00adma\u00addo\u00adres, garan\u00adtindo menores perdas que o tipo anterior;<\/p>\n<p>-N\u00facleo de ar: quando o \u00fanico mate\u00adrial no n\u00facleo \u00e9 o pr\u00f3prio ar. \u00c9 uti\u00adli\u00adzado para arma\u00adze\u00adnar energia de um campo mag\u00adn\u00e9\u00adtico, impedir a vari\u00ada\u00ad\u00e7\u00e3o de cor\u00adrente el\u00e9\u00adtrica (para formar um trans\u00adfor\u00adma\u00addor) e na grande maioria dos filtros, para excluir sinais de alta frequ\u00eancia;<\/p>\n<p>-N\u00facleo de ferrite: \u00e9 um n\u00facleo formado por uma cer\u00e2\u00admica de fer\u00adro\u00admag\u00adn\u00e9\u00adtica n\u00e3o con\u00addu\u00adtora, sendo bas\u00adtante usado em altas frequ\u00eancias.<\/p>\n","protected":false},"featured_media":26341,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","class_list":["post-26207","tnc_col_21662_item","type-tnc_col_21662_item","status-publish","format-standard","has-post-thumbnail","hentry","tnc_tax_22435-instrumeto","tnc_tax_16178-francisco-baguinski"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Bobina - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o<\/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:\/\/www.ufrgs.br\/amlef\/glossario\/bobina\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Bobina - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Bobina \u00e9 o enro\u00adla\u00admento de um fio, nor\u00admal\u00admente tem formato de anel, caracol ou espiral. \u00c9 um ins\u00adtru\u00admento muito impor\u00adtante na ele\u00adtr\u00f4\u00adnica, pos\u00adsi\u00adbi\u00adli\u00adtando a cria\u00e7\u00e3o de campos mag\u00adn\u00e9\u00adti\u00adcos a partir da pas\u00adsa\u00adgem de cor\u00adrente el\u00e9\u00adtrica pelo fio (um fen\u00f4\u00admeno expli\u00adcado pela Lei de Biot-Savart). 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