{"id":1285,"date":"2022-05-05T11:51:52","date_gmt":"2022-06-25T12:07:49","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=1285"},"modified":"2022-07-01T10:40:53","modified_gmt":"2022-07-01T08:40:53","slug":"020-magnetisation-2","status":"publish","type":"product","link":"https:\/\/experiments.school\/fr\/produkt\/020-magnetisation-2\/","title":{"rendered":"020 – Magn\u00e9tisation"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

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

magn\u00e9tisation au moyen d’un aimant permanent, ferromagn\u00e9tisme, aiguille magn\u00e9tique, boussole, champ magn\u00e9tique de la Terre, p\u00f4le Nord et p\u00f4le Sud\u00a0<\/span>\u00a0<\/span><\/p>\n[video width=\"1920\" height=\"1080\" mp4=\"https:\/\/experiments.school\/wp-content\/uploads\/2022\/05\/020-video.mp4\"][\/video]\n

Mat\u00e9riel:\u00a0<\/span>\u00a0<\/span><\/h2>\n
    \n
  • \u00a0\u00a0\u00a0 Aimant permanent (par ex. barreau aimant\u00e9, le plus puissant possible)\u00a0<\/span>\u00a0<\/span><\/li>\n
  • \u00a0\u00a0\u00a0 Lame de rasoir, y compris un rep\u00e8re (par ex. point rouge)\u00a0<\/span>\u00a0<\/span><\/li>\n
  • \u00a0\u00a0\u00a0 Bol avec de l’eau\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

    Mat\u00e9riel (alternatif):\u00a0<\/span>\u00a0<\/span><\/h2>\n
      \n
    • \u00a0\u00a0\u00a0 aiguille (par ex. \u00e9pingle)\u00a0<\/span> (1)<\/span><\/li>\n
    • \u00a0\u00a0 rondelles de li\u00e8ge \/ polystyr\u00e8ne \/ bois\u00a0 <\/span>(2)<\/span><\/li>\n
    • \u00a0\u00a0\u00a0 Aimant permanent (par ex. barreau aimant\u00e9, le plus puissant possible)\u00a0<\/span>\u00a0<\/span><\/li>\n
    • \u00a0\u00a0\u00a0 Bol avec de l’eau\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      \u00a0<\/span>R\u00e9alisation et observation:\u00a0<\/span>\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/h2>\n
        \n
      • \u00a0\u00a0\u00a0 Passe plusieurs fois un p\u00f4le de l’aimant permanent sur la lame de rasoir, si possible sur le dessus et le dessous.\u00a0<\/span>\u00a0<\/span><\/li>\n
      • \u00a0\u00a0\u00a0 Pose d\u00e9licatement la lame de rasoir sur la surface de l’eau.\u00a0<\/span>\u00a0<\/span><\/li>\n
      • \u00a0\u00a0\u00a0 Elle se retourne toujours dans le sens nord-sud, m\u00eame si on la tord.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

        Explication:\u00a0<\/span>\u00a0<\/span><\/h2>\n
          \n
        • En passant l’aimant permanent sur la lame de rasoir, les cercles de Weiss s’alignent dans le fer. <\/span><\/li>\n
        • La lame de rasoir devient ainsi elle-m\u00eame un aimant.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

          Potentiel didactique:\u00a0<\/span>\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/h2>\n
            \n
          • Un bel exercice de r\u00e9flexion consiste \u00e0 trouver l’orientation de la lame de rasoir. Il faut tenir compte du fait qu’au p\u00f4le nord g\u00e9ographique de la Terre se trouve un p\u00f4le sud magn\u00e9tique.\u00a0<\/span>\u00a0<\/span><\/li>\n
          • L’exp\u00e9rience consolide la repr\u00e9sentation mod\u00e8le des aimants \u00e9l\u00e9mentaires dans le fer.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

            Indications:\u00a0<\/span>\u00a0<\/span><\/h2>\n
              \n
            • L’aimantation peut \u00eatre annul\u00e9e par une forte secousse.\u00a0<\/span>\u00a0<\/span>\u00a0<\/span>\u00a0<\/span><\/li>\n
            • Attention : \u00e9loigner l’aimant permanent de la parabole pour qu’il ne perturbe pas le champ magn\u00e9tique terrestre.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

              Remarques sur le mat\u00e9riel alternatif:\u00a0<\/span>\u00a0<\/span><\/h2>\n
                \n
              • Avant de fixer l’aiguille sur le disque de li\u00e8ge, tester si elle est vraiment magn\u00e9tis\u00e9e (par exemple, la tenir contre une aiguille qui n’est pas encore magn\u00e9tis\u00e9e).\u00a0<\/span>\u00a0<\/span><\/li>\n
              • La p\u00e2te \u00e0 modeler convient bien pour fixer l’aiguille, mais il est \u00e9galement possible d’utiliser de la colle.\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

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