{"id":385,"date":"2020-04-16T19:34:05","date_gmt":"2020-04-16T19:34:05","guid":{"rendered":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/?page_id=385"},"modified":"2026-05-11T05:50:58","modified_gmt":"2026-05-11T05:50:58","slug":"dynamo","status":"publish","type":"page","link":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/exhibits\/em\/dynamo\/","title":{"rendered":"Dynamo"},"content":{"rendered":"

Dynamo<\/h1>\n\n\n
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Start By:<\/u><\/strong><\/p>\n\n\n\n

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  1. Pushing the Yellow button<\/strong> to start the power supply.<\/li>\n\n\n\n
  2. Take the Orange insulated cable<\/strong> in your hand and make the fuzzy<\/strong> end touch the copper disk lightly as seen in the above photo.<\/li>\n<\/ol>\n\n\n\n

    What happens to the copper disk?<\/u><\/strong><\/p>\n\n\n\n

    Answer: The disk begins to rotate!<\/p>\n\n\n\n

    WHY DOES THIS HAPPEN?<\/p>\n\n\n\n

    When the cable is touching the copper disk, an electrical current I<\/strong> flows from the center of the disk through the copper to the cable.<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    The large horseshoe magnet provides a magnetic field B<\/strong> perpendicular to the surface of the disk.<\/p>\n\n\n\n

    \"\"<\/figure><\/td>
    \"\"<\/figure><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    The Lorentz force law<\/strong> says current traveling through a magnetic field experiences a force, F<\/strong>, perpendicular to the direction of the current flow and to the direction of the magnetic field.<\/p>\n\n\n\n

    So, the disk experiences a force F<\/strong> that is perpendicular to both the current I<\/strong> and the magnetic field B<\/strong>; this force makes the disk rotate!<\/u><\/p>\n\n\n\n

     <\/p>\n\n\n\n

    Physics Lecture Demonstration Database<\/a> <\/b><\/i><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    Start By: What happens to the copper disk? Answer: The disk begins to rotate! WHY DOES THIS HAPPEN? When the cable is touching the copper disk, an electrical current I flows from the center of the disk through the copper to the cable. The large horseshoe magnet provides a magnetic field B perpendicular to the …<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":63,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uw_migration_status":"complete","_uw_gutenberg_post_content_before_migration":"","_uw_seo_meta_title":"","_uw_seo_meta_description":"","_uw_seo_twitter_card_type":"","_uw_seo_meta_image":"","_uw_seo_meta_image_url":"","_uw_seo_meta_image_sizes":[],"_uw_seo_custom_meta_tags":[],"footnotes":""},"class_list":["post-385","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/385","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/comments?post=385"}],"version-history":[{"count":5,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/385\/revisions"}],"predecessor-version":[{"id":947,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/385\/revisions\/947"}],"up":[{"embeddable":true,"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/pages\/63"}],"wp:attachment":[{"href":"https:\/\/wp.physics.wisc.edu\/ingersollmuseum\/wp-json\/wp\/v2\/media?parent=385"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}