{"id":53096,"date":"2017-09-26T22:49:01","date_gmt":"2017-09-26T19:49:01","guid":{"rendered":"http:\/\/www.lovendal.ro\/wp52\/?p=53096"},"modified":"2017-09-26T22:49:01","modified_gmt":"2017-09-26T19:49:01","slug":"magnetismul-o-forta-intunecata-cateva-lucruri-din-istoria-fascinanta-magnetului","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/magnetismul-o-forta-intunecata-cateva-lucruri-din-istoria-fascinanta-magnetului\/","title":{"rendered":"Magnetismul &#8211; o for\u0163\u0103 \u00eentunecat\u0103? C\u00e2teva lucruri din istoria fascinant\u0103 a magnetului"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/09\/magnet.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-53097\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/09\/magnet.jpg\" alt=\"\" width=\"335\" height=\"249\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/09\/magnet.jpg 335w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2017\/09\/magnet-300x223.jpg 300w\" sizes=\"auto, (max-width: 335px) 100vw, 335px\" \/><\/a>F\u0103r\u0103 \u00eendoial\u0103, constatarea c\u0103 fierul se \u201elipe\u015fte&#8221; de bolovanul adus din Asia Mic\u0103 trebuie s\u0103 fi l\u0103sat lumea \u00eencremenit\u0103 de uimire. Ciudatul mineral cu for\u0163e stranii, provenit din provincia Magnezia, a primit numele de &#8222;magnetit\u0103&#8221;. Aceasta se \u00eent\u00e2mpla pe vremea lui Tales din Milet, adic\u0103 acum 2.600 de ani.<\/p>\n<p>&nbsp;<\/p>\n<p>G\u0103sindu-i, tot pe atunci se pare, \u015fi o \u00eentrebuin\u0163are extrem de folositoare &#8211; busola -, oamenii s-au obi\u015fnuit repede \u015fi cu aceast\u0103 \u201eminune&#8221; r\u0103mas\u0103 nedezlegat\u0103, ca at\u00e2tea altele din epoc\u0103. Spiritele neobosite, mereu \u00een c\u0103utarea adev\u0103rului despre lume \u015fi via\u0163\u0103, au continuat \u00eens\u0103 s\u0103 se \u00eentrebe: &#8222;De ce?&#8221;<\/p>\n<p>R\u0103spunsurile pe care \u015fi le-au dat au fost dintre cele mai curioase. Atrac\u0163ia exercitat\u0103 de insolitul metal se producea, dup\u0103 Diogene din Appolonia \u00ee.Hr.), datorit\u0103 combin\u0103rii \u201eumidit\u0103\u0163ii&#8221; fierului cu \u201eusc\u0103ciunea&#8221; magnetitei. Epicur (341 &#8211; 270 \u00ee.Hr.), adept al atomismului antic, considera c\u0103 magnetita emite o serie de particule foarte fine care, p\u0103trunz\u00e2nd \u00een fier, provoac\u0103 atrac\u0163ia.<\/p>\n<p>Timp de mai bine de zece secole oamenii s-au mul\u0163umit cu constatarea c\u0103 acul magnetic al dispozitivului n\u0103scocit \u00een China se orienteaz\u0103 mereu spre acela\u015fi punct, indiferent cum l-ai mi\u015fca. Rena\u015fterea, cu marele s\u0103u impuls adus cunoa\u015fterii, deschide c\u00e2mp nou \u015fi cercet\u0103rilor asupra magnetismului. \u00cen 1269 Petrus Peregrinus stabile\u015fte polii magnetici, prin analogie cu cei ai p\u0103m\u00e2ntului. Pe la 1600, italianul Gianbattista della Porta efectueaz\u0103 \u015fi el o serie de experien\u0163e \u00een materie. Ambi\u0163ia sa este de a spulbera credin\u0163a marinarilor c\u0103 acului busolei i-ar d\u0103una usturoiul \u015fi ceapa &#8211; de care, \u00een consecin\u0163\u0103, ace\u015ftia nu se ating \u00een c\u0103l\u0103toriile lor pe mare.<\/p>\n<p>Primul pas real \u00een \u00een\u0163elegerea acestui fascinant domeniu al structurii materiei avea s\u0103-l fac\u0103 englezul William Gilbert, contemporan al reginei Elisabeta I al Angliei, supranumit \u015fi \u201ep\u0103rintele magnetismului&#8221;. Gilbert stabile\u015fte, \u00een urma unor experiment\u0103ri, c\u00e2teva principii ale magnetismului ce vor r\u0103m\u00e2ne, p\u00e2n\u0103 \u00een secolul al XIX-lea, neclintite. \u00cenl\u0103tur\u0103, printre altele, acea credin\u0163\u0103, \u00eenr\u0103d\u0103cinat\u0103 de sute de ani, \u00een virtutea c\u0103reia oamenii legau busola de un punct al cerului, explic\u00e2nd ac\u0163iunea asupra acului ca efect al magnetismului p\u0103m\u00e2ntului. Gilbert va s\u0103v\u00e2r\u015fi \u00eens\u0103 \u015fi o gre\u015feal\u0103, \u015fi aceasta se va men\u0163ine c\u00e2teva sute de ani: distinc\u0163ia net\u0103 \u00eentre magnetism \u015fi electricitate, considerate ca propriet\u0103\u0163i independente ale materiei. Numai marile descoperiri ale veacului al XIX-lea vor \u00eendrepta eroarea.<\/p>\n<p>\u00cen 1792, italianul Luigi Galvani descoperise curentul electric. \u00cen 1800, Alessandro Volta creeaz\u0103 pila electric\u0103, realiz\u00e2nd astfel saltul de la static la dinamic \u00een studiul fenomenelor electrice. \u00cen mod firesc a urmat \u015fi constatarea c\u0103 \u00eentre electrodinamic \u015fi magnetic exist\u0103 o str\u00e2ns\u0103 leg\u0103tur\u0103. Meritul revel\u0103rii acestui fapt \u00eei revine fizicianului danez Hans Christian Oersted. \u00cen 1820, dup\u0103 13 ani de \u00eencerc\u0103ri nereu\u015fite, Oersted demonstreaz\u0103 experimental c\u0103 orice curent electric \u00eenchis creeaz\u0103 un c\u00e2mp magnetic. \u00centreaga problem\u0103 a originii magnetismului apare \u00eentr-o lumin\u0103 nou\u0103.<\/p>\n<p>Celebrul Andre Marie Ampere emite o ipotez\u0103 extrem de \u00eendr\u0103znea\u0163\u0103: magnetismul nu este altceva dec\u00e2t o form\u0103 de manifestare a curen\u0163ilor galvanici. Feromagnetismul, dup\u0103 acela\u015fi savant, s-ar datora unor curen\u0163i electrici interni existen\u0163i \u00een materialul magnetic, care circul\u0103 \u00een planuri perpendiculare axei polare a magnetului. Savantul francez atribuia acestor curen\u0163i interni dimensiuni moleculare. Celebra ipotez\u0103 a lui Ampere asupra curen\u0163ilor moleculari avea s\u0103-\u015fi g\u0103seasc\u0103 confirmarea abia peste 100 de ani, c\u00e2nd se vor fi adunat suficiente cuno\u015ftin\u0163e asupra structurii materiei.<\/p>\n<p>Un important pas \u00eenainte \u00eel face Michael Faraday, care, la 29 august 1831, descoper\u0103 induc\u0163ia\u201d electromagnetic\u0103, cu uria\u015fe consecin\u0163e \u015ftiin\u0163ifice \u015fi practice. \u00cen 1850, la \u00eencheierea sistematicelor sale cercet\u0103ri, Faraday, cu o extraordinar\u0103 intui\u0163ie, nota: <em>&#8222;Nu cu mul\u0163i ani \u00een urm\u0103 magnetismul era pentru noi o for\u0163\u0103 \u00eentunecat\u0103, care ac\u0163iona numai asupra unui mic num\u0103r de corpuri. \u00cen prezent, \u015ftim \u00eens\u0103 c\u0103 ac\u0163ioneaz\u0103 asupra tuturor corpurilor \u015fi c\u0103 se afl\u0103 \u00een cea mai str\u00e2ns\u0103 leg\u0103tur\u0103 cu electricitatea, cu c\u0103ldura, cu ac\u0163iunea chimic\u0103, cu lumina, cu cristalizarea \u015fi, prin aceasta, cu for\u0163ele de coeziune&#8221;<\/em>. Modelul imaginat de Faraday pentru c\u00e2mpul electric \u015fi cel magnetic va servi fizicianului englez J.C. Maxwell la elaborarea sistemului care descrie o entitate fizic\u0103: c\u00eempul electromagnetic. Dac\u0103 Maxwell nu a putut oferi ca exemplu dec\u00e2t lumina, la doar c\u00e2\u0163iva ani dup\u0103 moartea sa, Heinrich Hertz reu\u015fe\u015fte s\u0103 produc\u0103 alte tipuri de unde electromagnetice. Ne apropiem de inventarea radioului, iar magnetismul \u00eenceteaz\u0103 s\u0103 mai par\u0103 omenirii \u201eo for\u0163\u0103 \u00eentunecat\u0103&#8221;.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>F\u0103r\u0103 \u00eendoial\u0103, constatarea c\u0103 fierul se \u201elipe\u015fte&#8221; de bolovanul adus din Asia Mic\u0103 trebuie s\u0103 fi l\u0103sat lumea \u00eencremenit\u0103 de uimire. Ciudatul mineral cu for\u0163e stranii, provenit din provincia Magnezia, a primit numele de &#8222;magnetit\u0103&#8221;. Aceasta se \u00eent\u00e2mpla pe vremea &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Magnetismul &#8211; o for\u0163\u0103 \u00eentunecat\u0103? C\u00e2teva lucruri din istoria fascinant\u0103 a magnetului\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/magnetismul-o-forta-intunecata-cateva-lucruri-din-istoria-fascinanta-magnetului\/#more-53096\" aria-label=\"Cite\u0219te mai multe despre Magnetismul &#8211; o for\u0163\u0103 \u00eentunecat\u0103? C\u00e2teva lucruri din istoria fascinant\u0103 a magnetului\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":53097,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11042,2833],"tags":[11603,12042,2270,7792,446,1755,4359,63,12044,2677,1941,11043,12041,5908,952,7909,4809,12043,345,4974,8360,1593,481,12045,2648,2624],"class_list":["post-53096","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fizica-chimie","category-noutati","tag-ampere","tag-anlia","tag-asia","tag-ceapa","tag-china","tag-electricitate","tag-electromagnetism","tag-elisabeta-i","tag-epicur","tag-faraday","tag-fier","tag-fizica-chimie","tag-galvani","tag-italian","tag-lumina","tag-magnet","tag-magnetism","tag-magnetita","tag-materie","tag-maxwell","tag-pol-magnetic","tag-regina","tag-renastere","tag-tales","tag-usturoi","tag-volta","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Magnetismul - o for\u0163\u0103 \u00eentunecat\u0103? 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