{"id":1522,"date":"2022-05-05T13:48:55","date_gmt":"2022-06-25T11:34:06","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=1522"},"modified":"2022-07-01T10:38:50","modified_gmt":"2022-07-01T08:38:50","slug":"1522","status":"publish","type":"product","link":"https:\/\/experiments.school\/fr\/produkt\/1522\/","title":{"rendered":"031 – Propulsion par courants de Foucault"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Inversion du freinage par courants de Foucault\u00a0\u00a0<\/strong><\/h2>\n

Introduction \u00e0 :\u00a0<\/span>\u00a0<\/span><\/h2>\n

Courants de Foucault, force de Lorentz\u00a0<\/span>\u00a0<\/span><\/p>\n

https:\/\/experiments.school\/wp-content\/uploads\/2022\/05\/031-end.mp4<\/p>\n

 <\/p>\n

Mat\u00e9riel: <\/span>\u00a0<\/span><\/h2>\n
    \n
  • Aimant en forme de barreau <\/span>\u00a0<\/span><\/li>\n
  • Feuille d’aluminium (env. 30 cm x 30 cm) <\/span>\u00a0<\/span><\/li>\n
  • Assiette (creuse, \u00e0 soupe) remplie d’eau\u00a0 <\/span><\/li>\n<\/ul>\n

    Observation: <\/span>\u00a0<\/span><\/h2>\n

    La feuille d’aluminium est mise en rotation par le mouvement circulaire du barreau aimant\u00e9.\u00a0<\/span>\u00a0<\/span><\/p>\n

    Instructions: <\/span>\u00a0<\/span><\/h2>\n
      \n
    • plier les bords lat\u00e9raux de la feuille d’aluminium 3 fois en alternance dans le sens de la longueur et de la largeur.\u00a0 <\/span>\u00a0<\/span><\/li>\n
    • plier le rectangle obtenu \u00e0 l’\u0153il nu pour former un carr\u00e9 <\/span>\u00a0<\/span><\/li>\n
    • replier les 4 coins vers l’arri\u00e8re de mani\u00e8re \u00e0 obtenir un hexagone.\u00a0 <\/span>\u00a0<\/span><\/li>\n
    • poser l’hexagone termin\u00e9 sur la surface de l’eau, c\u00f4t\u00e9 lisse vers le haut <\/span>\u00a0<\/span><\/li>\n
    • d\u00e9placer un p\u00f4le de l’aimant en cercle sur le bord du film plastique <\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      Conseils: <\/span>\u00a0<\/span><\/h2>\n
        \n
      • d\u00e9placer l’aimant r\u00e9guli\u00e8rement et pas trop vite <\/span>\u00a0<\/span><\/li>\n
      • une cuvette remplie jusqu’au bord est optimale <\/span>\u00a0<\/span><\/li>\n<\/ul>\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.\u00a0 <\/span>\u00a0<\/span><\/li>\n
        • Le m\u00e9tal contient des \u00e9lectrons libres qui se d\u00e9placent par rapport au champ magn\u00e9tique.\u00a0 <\/span>\u00a0<\/span><\/li>\n
        • La force de Lorentz sur eux entra\u00eene des courants d\u00e9sordonn\u00e9s dans le m\u00e9tal, appel\u00e9s courants de Foucault (induction).\u00a0 <\/span>\u00a0<\/span><\/li>\n
        • Selon la r\u00e8gle de Lenz, l’effet d’induction est dirig\u00e9 dans le sens oppos\u00e9 \u00e0 sa cause (la rotation par rapport \u00e0 l’aimant).\u00a0 <\/span>\u00a0<\/span><\/li>\n
        • C’est pourquoi il se produit un couple sur le disque en aluminium, de sorte que sa rotation se rapproche de la rotation de l’aimant. <\/span>\u00a0<\/span><\/li>\n<\/ul>\n","protected":false},"featured_media":1523,"template":"","meta":[],"product_brand":[],"product_cat":[991,883,893],"product_tag":[],"class_list":{"0":"post-1522","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":"product_cat-g-tours-de-magie-fr","9":"","10":"woocommerce-text-align-left","11":"woocommerce-image-align-center","13":"first","14":"instock","15":"shipping-taxable","16":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product\/1522","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\/1523"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/media?parent=1522"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_brand?post=1522"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_cat?post=1522"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/fr\/wp-json\/wp\/v2\/product_tag?post=1522"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}