{"id":2441,"date":"2022-02-11T11:27:58","date_gmt":"2022-02-11T11:27:58","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/loi-de-conservation-de-la-charge-electrique\/"},"modified":"2022-06-10T13:16:21","modified_gmt":"2022-06-10T13:16:21","slug":"loi-de-conservation-de-la-charge-electrique","status":"publish","type":"page","link":"https:\/\/www.electricity-magnetism.org\/fr\/electrostatique\/charge-electrique\/loi-de-conservation-de-la-charge-electrique\/","title":{"rendered":"Loi de conservation de la charge \u00e9lectrique"},"content":{"rendered":"
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<\/path><\/svg><\/span>R\u00e9sum\u00e9 de 30 secondes<\/span><\/h2>\n\n\n\n

Conservation de la charge \u00e9lectrique<\/h2>\n\n\n\n

Une charge \u00e9lectrique est une quantit\u00e9 physique et une propri\u00e9t\u00e9 de la mati\u00e8re qui lui fait subir une force lorsqu’elle est plac\u00e9e dans un champ \u00e9lectromagn\u00e9tique. <\/p>\n\n\n\n

La loi de conservation de la charge \u00e9lectrique<\/strong> stipule que : <\/p>\n\n\n\n

La somme alg\u00e9brique de toutes les charges \u00e9lectriques dans tout syst\u00e8me ferm\u00e9 est constante. <\/em><\/p>\n\n\n\n

Le deuxi\u00e8me principe important est :<\/strong><\/p>\n\n\n\n

L’amplitude de la charge de l’\u00e9lectron ou du proton est une unit\u00e9 naturelle de charge.<\/em><\/p>\n\n<\/div><\/div><\/div>\n\n

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\"loi
Conservation de la charge \u00e9lectrique dans la d\u00e9sint\u00e9gration b\u00eata. La loi de conservation de la charge \u00e9lectrique stipule que la somme alg\u00e9brique de toutes les charges \u00e9lectriques dans tout syst\u00e8me ferm\u00e9 est constante.<\/figcaption><\/figure>\n<\/div><\/div><\/div>\n<\/div>\n<\/div>
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Loi de conservation de la charge \u00e9lectrique <\/h2>\n\n<\/div><\/div>\n
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En physique, il existe deux principes tr\u00e8s importants concernant la charge \u00e9lectrique.<\/p>\n\n\n\n

La premi\u00e8re est la loi de conservation de la charge \u00e9lectrique<\/strong> . Cette loi stipule que :<\/p>\n\n\n\n

La somme alg\u00e9brique de toutes les charges \u00e9lectriques dans tout syst\u00e8me ferm\u00e9 est constante.<\/em><\/p><\/blockquote>\n\n\n\n

La seule fa\u00e7on de modifier la charge nette d’un syst\u00e8me est d’apporter une charge d’ailleurs ou de supprimer une charge du syst\u00e8me. La charge peut \u00eatre cr\u00e9\u00e9e et d\u00e9truite, mais uniquement par paires positives-n\u00e9gatives.<\/p>\n\n\n\n

La conservation de la charge<\/strong> est consid\u00e9r\u00e9e comme une loi de conservation universelle<\/strong> . Aucune preuve exp\u00e9rimentale d’une quelconque violation de ce principe n’a jamais \u00e9t\u00e9 observ\u00e9e. En physique des particules, la conservation de la charge signifie que dans les r\u00e9actions de particules \u00e9l\u00e9mentaires qui cr\u00e9ent des particules charg\u00e9es, des nombres \u00e9gaux de particules positives et n\u00e9gatives sont toujours cr\u00e9\u00e9s, en gardant la quantit\u00e9 nette de charge inchang\u00e9e<\/strong> . M\u00eame dans les interactions \u00e0 haute \u00e9nergie dans lesquelles des particules sont cr\u00e9\u00e9es et d\u00e9truites, telles que la cr\u00e9ation de paires positron-\u00e9lectron<\/strong><\/a> , la charge totale de tout syst\u00e8me ferm\u00e9 est exactement constante.<\/p>\n\n\n\n

Le deuxi\u00e8me principe important est :<\/strong><\/p>\n\n\n\n

L’amplitude de la charge de l’\u00e9lectron ou du proton est une unit\u00e9 naturelle de charge.<\/em><\/p>\n\n\n\n

On dit que la charge est quantifi\u00e9e<\/strong> . Autrement dit, chaque quantit\u00e9 observable de charge \u00e9lectrique est toujours un multiple entier de cette unit\u00e9 de base. Cette unit\u00e9 est appel\u00e9e charge \u00e9l\u00e9mentaire<\/strong> , e<\/em> , environ \u00e9gale \u00e0 1,602\u00d710 \u221219<\/sup><\/strong> coulombs (sauf pour les particules appel\u00e9es quarks, qui ont des charges qui sont des multiples entiers de 1\u20443 e<\/em> ).<\/p>\n\n<\/div><\/div>\n

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\"FAQ\"<\/figure>
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Questions fr\u00e9quemment pos\u00e9es<\/p>\n<\/div><\/div>\n\n\n\n

Quelles particules dans les atomes ont une charge \u00e9lectrique ?<\/strong>


Un atome est constitu\u00e9 d’un noyau charg\u00e9 positivement entour\u00e9 d’\u00e9lectrons charg\u00e9s n\u00e9gativement, de sorte que l’atome dans son ensemble est \u00e9lectriquement neutre. Le noyau atomique est constitu\u00e9 de protons charg\u00e9s positivement et de neutrons neutres.<\/p> <\/div>

Quelle est l’unit\u00e9 de charge \u00e9lectrique ?<\/strong>

Le coulomb (symbole : C) est l’unit\u00e9 de charge \u00e9lectrique du Syst\u00e8me international d’unit\u00e9s (SI). Le coulomb \u00e9tait d\u00e9fini comme la quantit\u00e9 d’\u00e9lectricit\u00e9 transport\u00e9e en une seconde par un courant d’un amp\u00e8re : 1 C = 1 A \u00d7 1 s
<\/p> <\/div>

Pourquoi la loi de conservation de la charge est-elle si importante ?<\/strong>

Ce concept est important pour toutes les r\u00e9actions nucl\u00e9aires – d\u00e9sint\u00e9gration alpha, d\u00e9sint\u00e9gration b\u00eata, d\u00e9sint\u00e9gration gamma, etc. \u2014 parce qu’il permet aux scientifiques de pr\u00e9dire la composition du produit final dans la r\u00e9action. Dans ces r\u00e9actions, un noyau se transforme en un type diff\u00e9rent de noyau ou de noyaux, tandis que la charge est conserv\u00e9e.<\/p> <\/div> <\/div>\n\n\n\n

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\n\n\n<\/span>\n<\/span>\n<\/span>\n<\/span>\n Prochain \nArticle\n<\/a>\n\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"

En physique, il existe deux principes tr\u00e8s importants concernant la charge \u00e9lectrique. La premi\u00e8re est la loi de conservation de la charge \u00e9lectrique . 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