{"id":206833,"date":"2025-04-14T19:37:21","date_gmt":"2025-04-14T19:37:21","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=206833"},"modified":"2025-04-14T19:37:43","modified_gmt":"2025-04-14T19:37:43","slug":"explain-why-its-d-if-released-from-rest-the-current-loop-will-move-upward","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/04\/14\/explain-why-its-d-if-released-from-rest-the-current-loop-will-move-upward\/","title":{"rendered":"explain why its D If released from rest, the current loop will Move upward"},"content":{"rendered":"\n

explain why its D If released from rest, the current loop will Move upward. Move downward. Rotate clockwise. Rotate counterclockwise. Do something not listed here.<\/p>\n\n\n\n

The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n

\n\n\n\n

Correct Answer: D \u2014 Rotate counterclockwise<\/strong><\/h3>\n\n\n\n
\n\n\n\n

Explanation (300 words)<\/strong><\/h3>\n\n\n\n

This scenario likely involves a current-carrying loop<\/strong> placed in a uniform magnetic field<\/strong>. For simplicity, imagine a vertical rectangular loop hanging in a uniform magnetic field directed into the page (denoted by “X” symbols). The loop is initially at rest and carries a steady current<\/strong>, say, clockwise when viewed from the front.<\/p>\n\n\n\n

Each segment of the loop experiences a magnetic force<\/strong> given by the Lorentz force law<\/strong>:
[
\\vec{F} = I \\, \\vec{L} \\times \\vec{B}
]
where:<\/p>\n\n\n\n

    \n
  • ( I ) is the current,<\/li>\n\n\n\n
  • ( \\vec{L} ) is the direction of the current segment,<\/li>\n\n\n\n
  • ( \\vec{B} ) is the magnetic field.<\/li>\n<\/ul>\n\n\n\n

    For the top and bottom horizontal segments<\/strong>, the magnetic forces are equal in magnitude and opposite in direction, so they cancel out. However, for the left and right vertical segments<\/strong>, the direction of current is opposite, so they experience forces in opposite vertical directions due to the cross product.<\/p>\n\n\n\n

    These opposing vertical forces on either side of the loop create a torque<\/strong>, causing the loop to rotate<\/strong>. Since the current flows downward on the left side and upward on the right, and the magnetic field is into the page, the left side feels a force up<\/strong>, and the right side feels a force down<\/strong>. This combination produces a counterclockwise torque<\/strong>.<\/p>\n\n\n\n

    Hence, the loop starts rotating counterclockwise<\/strong> when released from rest.<\/p>\n\n\n\n

    This behavior is the basis of electric motors, where torque is generated by interactions between current-carrying loops and magnetic fields.<\/p>\n\n\n\n

    So, the loop does not move up or down<\/strong>, and it does not rotate clockwise<\/strong>\u2014it rotates counterclockwise<\/strong> due to the torque generated by the magnetic forces acting on the loop.<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n
    \n","protected":false},"excerpt":{"rendered":"

    explain why its D If released from rest, the current loop will Move upward. Move downward. Rotate clockwise. Rotate counterclockwise. Do something not listed here. The correct answer and explanation is : Correct Answer: D \u2014 Rotate counterclockwise Explanation (300 words) This scenario likely involves a current-carrying loop placed in a uniform magnetic field. For […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-206833","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206833","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=206833"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/206833\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=206833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=206833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=206833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}