{"id":88803,"date":"2025-06-01T07:21:31","date_gmt":"2025-06-01T07:21:31","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88803"},"modified":"2025-06-01T07:21:31","modified_gmt":"2025-06-01T07:21:31","slug":"imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l\/","title":{"rendered":"Imagine a current-carrying straight conductor with magnetic field of l"},"content":{"rendered":"

Imagine a current-carrying straight conductor with magnetic field of lines in anti-clockwise direction. Then the direction of current is determined by<\/p>\n

[amp_mcq option1=”the Right-Hand Thumb rule and it would be in the downward direction.” option2=”the Left-Hand Thumb rule and it would be in the downward direction.” option3=”the Right-Hand Thumb rule and it would be in the upward direction.” option4=”the Left-Hand Thumb rule and it would be in the upward direction.” correct=”option3″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC NDA-2 – 2021<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule (also known as Ampere’s Right-Hand Rule). According to this rule, if you point the thumb of your right hand in the direction of the conventional current, your fingers curl in the direction of the magnetic field lines around the wire. The question states the magnetic field lines are in an anti-clockwise direction when viewed from a certain perspective (presumably from above the conductor). If the current were downwards, using the right-hand rule, your fingers would curl clockwise. If the current were upwards, your fingers would curl anti-clockwise. Since the magnetic field is anti-clockwise, the current must be in the upward direction, and the rule used is the Right-Hand Thumb rule.<\/section>\n
The Right-Hand Thumb Rule for a straight conductor states: Point your right thumb in the direction of the conventional current. Your fingers curl in the direction of the magnetic field. An anti-clockwise magnetic field (when looking down onto the wire) implies the current is flowing upwards.<\/section>\n
The Left-Hand Rule is typically used in contexts involving forces on current-carrying conductors in magnetic fields (Fleming’s Left-Hand Rule) or for the direction of force on a moving charge in a magnetic field. For determining the direction of the magnetic field created by a current, the Right-Hand Rule is used.<\/section>\n","protected":false},"excerpt":{"rendered":"

Imagine a current-carrying straight conductor with magnetic field of lines in anti-clockwise direction. Then the direction of current is determined by [amp_mcq option1=”the Right-Hand Thumb rule and it would be in the downward direction.” option2=”the Left-Hand Thumb rule and it would be in the downward direction.” option3=”the Right-Hand Thumb rule and it would be in … <\/p>\n

Detailed SolutionImagine a current-carrying straight conductor with magnetic field of l<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1094],"tags":[1110,1201,1128],"class_list":["post-88803","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1110","tag-electric-current","tag-physics","no-featured-image-padding"],"yoast_head":"\nImagine a current-carrying straight conductor with magnetic field of l<\/title>\n<meta name=\"description\" content=\"The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule (also known as Ampere's Right-Hand Rule). According to this rule, if you point the thumb of your right hand in the direction of the conventional current, your fingers curl in the direction of the magnetic field lines around the wire. The question states the magnetic field lines are in an anti-clockwise direction when viewed from a certain perspective (presumably from above the conductor). If the current were downwards, using the right-hand rule, your fingers would curl clockwise. If the current were upwards, your fingers would curl anti-clockwise. Since the magnetic field is anti-clockwise, the current must be in the upward direction, and the rule used is the Right-Hand Thumb rule. The Right-Hand Thumb Rule for a straight conductor states: Point your right thumb in the direction of the conventional current. Your fingers curl in the direction of the magnetic field. An anti-clockwise magnetic field (when looking down onto the wire) implies the current is flowing upwards.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Imagine a current-carrying straight conductor with magnetic field of l\" \/>\n<meta property=\"og:description\" content=\"The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule (also known as Ampere's Right-Hand Rule). According to this rule, if you point the thumb of your right hand in the direction of the conventional current, your fingers curl in the direction of the magnetic field lines around the wire. The question states the magnetic field lines are in an anti-clockwise direction when viewed from a certain perspective (presumably from above the conductor). If the current were downwards, using the right-hand rule, your fingers would curl clockwise. If the current were upwards, your fingers would curl anti-clockwise. Since the magnetic field is anti-clockwise, the current must be in the upward direction, and the rule used is the Right-Hand Thumb rule. The Right-Hand Thumb Rule for a straight conductor states: Point your right thumb in the direction of the conventional current. Your fingers curl in the direction of the magnetic field. An anti-clockwise magnetic field (when looking down onto the wire) implies the current is flowing upwards.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:21:31+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Imagine a current-carrying straight conductor with magnetic field of l","description":"The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule (also known as Ampere's Right-Hand Rule). 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An anti-clockwise magnetic field (when looking down onto the wire) implies the current is flowing upwards.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l\/","og_locale":"en_US","og_type":"article","og_title":"Imagine a current-carrying straight conductor with magnetic field of l","og_description":"The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule (also known as Ampere's Right-Hand Rule). According to this rule, if you point the thumb of your right hand in the direction of the conventional current, your fingers curl in the direction of the magnetic field lines around the wire. 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An anti-clockwise magnetic field (when looking down onto the wire) implies the current is flowing upwards.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T07:21:31+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l\/","url":"https:\/\/exam.pscnotes.com\/mcq\/imagine-a-current-carrying-straight-conductor-with-magnetic-field-of-l\/","name":"Imagine a current-carrying straight conductor with magnetic field of l","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T07:21:31+00:00","dateModified":"2025-06-01T07:21:31+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule (also known as Ampere's Right-Hand Rule). 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