{"id":975,"date":"2022-03-31T13:57:15","date_gmt":"2022-04-28T10:34:59","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=975"},"modified":"2022-07-01T10:45:17","modified_gmt":"2022-07-01T08:45:17","slug":"030-frein-a-courants-de-foucault","status":"publish","type":"product","link":"https:\/\/experiments.school\/fr\/produkt\/030-frein-a-courants-de-foucault\/","title":{"rendered":"030 – Frein \u00e0 courants de Foucault"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

\u00c9crou<\/span> de <\/span>vis<\/span> frein\u00e9<\/span> par <\/span>induction<\/span><\/span><\/strong><\/h2>\n

Introduction \u00e0:<\/h2>\n

R\u00e8gle de Lenz, courants de Foucault, force de Lorentz<\/span>\u00a0<\/span><\/p>\n

https:\/\/experiments.school\/wp-content\/uploads\/2022\/04\/030-end.mp4<\/p>\n

Mat\u00e9riel :<\/span>\u00a0<\/span><\/h2>\n
    \n
  • Aimant en fer \u00e0 cheval<\/span>\u00a0<\/span><\/li>\n
  • \u00c9crou de vis en m\u00e9tal\u00a0<\/span>
    \n<\/span><\/li>\n<\/ul>\n

    Instructions :<\/span>\u00a0<\/span><\/h2>\n
      \n
    • Faire tourner l’\u00e9crou en le claquant avec les doigts.<\/span>\u00a0<\/span><\/li>\n
    • Tenir l’aimant au-dessus de mani\u00e8re \u00e0 ce que l’\u00e9crou soit centr\u00e9 entre les p\u00f4les.\u00a0 <\/span>
      \n<\/span><\/li>\n<\/ul>\n

      Conseils :<\/span>\u00a0<\/span><\/h2>\n
        \n
      • Tenir l’aimant en biais et le faire bouger avec l’\u00e9crou pour \u00e9viter qu’il ne colle \u00e0 l’aimant. <\/span>\u00a0<\/span><\/li>\n
      • Les pi\u00e8ces de monnaie ne conviennent pas<\/span>
        \n<\/span><\/li>\n<\/ul>\n

        Observation :<\/span>\u00a0<\/span><\/h2>\n
          \n
        • La rotation de l’\u00e9crou est fortement frein\u00e9e dans le champ magn\u00e9tique.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

          \u00a0<\/span>\u00a0<\/span><\/p>\n

          Explication :<\/span>\u00a0<\/span><\/h2>\n
            \n
          • Les charges en mouvement dans un champ magn\u00e9tique subissent une force perpendiculaire aux lignes du champ, la force de Lorentz. <\/span><\/li>\n
          • Le m\u00e9tal contient des \u00e9lectrons libres qui tournent avec lui, la force de Lorentz exerc\u00e9e sur eux entra\u00eene des courants d\u00e9sordonn\u00e9s dans le m\u00e9tal, appel\u00e9s courants de Foucault (induction). <\/span><\/li>\n
          • Selon la r\u00e8gle de Lenz, l’effet d’induction est oppos\u00e9 \u00e0 sa cause (la rotation dans le champ magn\u00e9tique). La rotation est donc frein\u00e9e.<\/span>\u00a0<\/span><\/li>\n
          • D’un point de vue \u00e9nerg\u00e9tique, l’\u00e9nergie de rotation est transform\u00e9e en \u00e9nergie \u00e9lectrique et finalement en \u00e9nergie thermique.<\/span>\u00a0<\/span><\/li>\n
          • L’impulsion de rotation est alors transmise \u00e0 l’aimant (non perceptible).<\/span>\u00a0<\/span><\/li>\n<\/ul>\n","protected":false},"featured_media":976,"template":"","meta":[],"product_brand":[],"product_cat":[991,883],"product_tag":[],"class_list":{"0":"post-975","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-7-force-de-lorentz-induction","7":"product_cat-b-electricite-fr","8":"","9":"woocommerce-text-align-left","10":"woocommerce-image-align-center","12":"first","13":"instock","14":"shipping-taxable","15":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product\/975","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/media\/976"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/media?parent=975"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_brand?post=975"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_cat?post=975"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_tag?post=975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}