{"id":856,"date":"2022-03-31T13:57:15","date_gmt":"2022-03-31T12:04:47","guid":{"rendered":"https:\/\/experiments.school\/?post_type=product&#038;p=856"},"modified":"2022-07-01T10:45:05","modified_gmt":"2022-07-01T08:45:05","slug":"0030-eddy-current-brake","status":"publish","type":"product","link":"https:\/\/experiments.school\/en\/product\/0030-eddy-current-brake\/","title":{"rendered":"030 &#8211; Eddy current brake"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<h2><strong>Inductively braked screw-nut<\/strong><\/h2>\n<h2>Introduction to:<\/h2>\n<p><span data-contrast=\"auto\">Lenz&#8217;s rule, eddy current, Lorentz force<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">\u00a0<\/span><\/p>\n<p>https:\/\/experiments.school\/wp-content\/uploads\/2022\/04\/030-end.mp4<\/p>\n<h2>Material:<\/h2>\n<ul>\n<li>Horseshoe magnet<\/li>\n<li>Metal screw-nut<\/li>\n<\/ul>\n<h2>Instructions:<\/h2>\n<ul>\n<li>Set the nut into rotation by snapping your fingers.<\/li>\n<li>Hold magnet over it so that the nut is centered between the poles.<\/li>\n<\/ul>\n<h2>Tips:<\/h2>\n<ul>\n<li>Hold the magnet at an angle and move it along with the nut to prevent it from sticking to the magnet<\/li>\n<li>Coins are unsuitable<\/li>\n<\/ul>\n<h2>Observation:<\/h2>\n<p>The rotation of the nut is strongly decelerated in the magnetic field.<\/p>\n<h2>Explanation:<\/h2>\n<ul>\n<li>Moving charges in a magnetic field experience a force perpendicular to the field lines, the Lorentz force.<\/li>\n<li>There are free electrons in the metal, which spin with it, the Lorentz force on them leads to disordered currents in the metal, the so-called eddy currents (induction).<\/li>\n<li>According to Lenz&#8217;s rule, the induction effect is directed against its cause (the rotation in the magnetic field). So the rotation is decelerated.<\/li>\n<li>From an energetic point of view, rotational energy is converted into electrical energy and finally into thermal energy.<\/li>\n<li>The angular momentum is transferred to the magnet (not noticeable).<\/li>\n<\/ul>\n","protected":false},"featured_media":974,"template":"","meta":[],"product_brand":[],"product_cat":[990,874],"product_tag":[],"class_list":{"0":"post-856","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":"","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\/en\/wp-json\/wp\/v2\/product\/856","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\/974"}],"wp:attachment":[{"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/media?parent=856"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_brand?post=856"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_cat?post=856"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/experiments.school\/en\/wp-json\/wp\/v2\/product_tag?post=856"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}