{"id":1001,"date":"2022-05-05T13:48:55","date_gmt":"2022-05-05T11:57:05","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&p=1001"},"modified":"2022-07-01T10:38:40","modified_gmt":"2022-07-01T08:38:40","slug":"031-drive-by-eddy-currents","status":"publish","type":"product","link":"https:\/\/experiments.school\/en\/product\/031-drive-by-eddy-currents\/","title":{"rendered":"031 – Drive by eddy currents"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"

Reversal of eddy current brake\u00a0<\/strong>\u00a0<\/span><\/h2>\n

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

Eddy currents, Lorentz force\u00a0<\/span>\u00a0<\/span><\/p>\n

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

 <\/p>\n

Material:\u00a0<\/span>\u00a0<\/span><\/h2>\n
    \n
  • Bar magnet <\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/li>\n
  • Aluminum foil (approx. 30 cm x 30 cm) <\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span><\/li>\n
  • Plate (deep, soup plate), filled with water <\/span>\u00a0<\/span><\/li>\n<\/ul>\n

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

    The aluminum foil rotates due to the circular motion of the bar magnet.\u00a0<\/span>\u00a0<\/span><\/p>\n

    Instructions:\u00a0<\/span>\u00a0<\/span><\/h2>\n
      \n
    • Fold the side edges of the aluminum foil 3 times on top of each other, alternating lengthwise and crosswise<\/span>\u00a0<\/span><\/li>\n
    • fold the resulting rectangle to a square by eye<\/span>\u00a0<\/span><\/li>\n
    • bend the 4 corners to the backside, so that a hexagon is formed\u00a0 <\/span>\u00a0<\/span><\/li>\n
    • place the finished hexagon on the water surface with the smooth side up<\/span>\u00a0<\/span><\/li>\n
    • move one pole of the magnet over the edge of the foil in a circular motion<\/span>
      \n<\/span><\/li>\n<\/ul>\n

      Tips:\u00a0<\/span>\u00a0<\/span><\/h2>\n
        \n
      • move the magnet evenly and not too fast\u00a0<\/span>\u00a0<\/span><\/li>\n
      • a bowl filled to the brim is optimal\u00a0<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

        Explanation:\u00a0<\/span>\u00a0<\/span><\/h2>\n
          \n
        • Moving charges in a magnetic field experience a force perpendicular to the field lines, the so-called Lorentz force. <\/span><\/li>\n
        • In the metal, there are free electrons moving with respect to the magnetic field. <\/span><\/li>\n
        • T<\/span>he Lorentz force acting on them leads to disordered currents in the metal, the so-called eddy currents (induction). <\/span><\/li>\n
        • According to Lenz’s rule, the induction effect is opposite to its cause (the rotation with respect to the magnet). <\/span><\/li>\n
        • Therefore, a torque is created on the aluminum disk so that its motion converges towards the same rotation as the magnet.<\/span><\/li>\n<\/ul>\n","protected":false},"featured_media":1405,"template":"","meta":[],"product_brand":[],"product_cat":[990,874,880],"product_tag":[],"class_list":{"0":"post-1001","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-7-lorentz-force-induction","7":"product_cat-b-electricity","8":"product_cat-g-magic-tricks-en","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\/en\/wp-json\/wp\/v2\/product\/1001","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/media\/1405"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/media?parent=1001"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_brand?post=1001"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_cat?post=1001"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_tag?post=1001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}