{"id":426466,"date":"2017-06-27T02:00:00","date_gmt":"2017-06-26T23:00:00","guid":{"rendered":"https:\/\/www.fyysika.ee\/?guid=3b366bfdc6708e2f91c9634f6a1bebac"},"modified":"2017-06-27T02:00:00","modified_gmt":"2017-06-26T23:00:00","slug":"forces-on-a-current-carrying-wire-in-a-magnetic-field-the-macro-micro-connection-2","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=426466","title":{"rendered":"Forces on a current-carrying wire in a magnetic field: the macro\u2013micro connection"},"content":{"rendered":"<p>The classic problem of determining the force on a current-carrying wire in a magnetic field is<br \/>\ncritically analysed. A common explanation found in many introductory textbooks is to represent the<br \/>\nforce on the wire as the sum of the forces on charge carriers. In this approach neither the nature<br \/>\nof the forces involved nor their application points are fully discussed. In this paper we provide an<br \/>\nalternative microscopic explanation that is suitable for introductory electromagnetism courses at<br \/>\nuniversity level. By considering the wire as a superposition of a positive and a negative<br \/>\ncylindrical charge distributions, we show that the electrons are subject to both magnetic and<br \/>\nelectric forces, whereas the ionic lattice of the metal is dragged by an electric force.<br \/>\nFurthermore, an analysis of the orders of magnitude involved in the problem gives counterintuitive<br \/>\nresults with valuable educational potential. We argue that this approach allows one to discuss<br \/>\ndifferent aspects of the physical &#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The classic problem of determining the force on a current-carrying wire in a magnetic field is<br \/>\ncritically analysed. A common explanation found in many introductory textbooks is to represent the<br \/>\nforce on the wire as the sum of the forces on charge car&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-426466","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/426466","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=426466"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/426466\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=426466"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=426466"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=426466"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}