{"id":88131,"date":"2025-06-01T07:03:04","date_gmt":"2025-06-01T07:03:04","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88131"},"modified":"2025-06-01T07:03:04","modified_gmt":"2025-06-01T07:03:04","slug":"two-long-wires-each-carrying-a-d-c-current-in-the-same-direction-are","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/two-long-wires-each-carrying-a-d-c-current-in-the-same-direction-are\/","title":{"rendered":"Two long wires each carrying a d.c. current in the same direction are"},"content":{"rendered":"

Two long wires each carrying a d.c. current in the same direction are placed close to each other. Which one of the following statements is correct?<\/p>\n

[amp_mcq option1=”The wires will attract each other” option2=”The wires will repel each other” option3=”There will be no force between the wires” option4=”There will be a force between the wires only at the moment when the current is switched ON or OFF” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2015<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nWhen two parallel wires carry electric currents in the same direction, they produce magnetic fields that interact in such a way as to cause an attractive force between the wires.
\n<\/section>\n
\nThis is a fundamental principle of electromagnetism: Parallel currents in the same direction attract, and parallel currents in opposite directions repel.
\n<\/section>\n
\nThe force per unit length between two parallel wires carrying currents I\u2081 and I\u2082 separated by a distance r is given by F\/L = (\u03bc\u2080 * I\u2081 * I\u2082) \/ (2 * \u03c0 * r), where \u03bc\u2080 is the permeability of free space. The direction of the force depends on the relative direction of the currents.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Two long wires each carrying a d.c. current in the same direction are placed close to each other. Which one of the following statements is correct? [amp_mcq option1=”The wires will attract each other” option2=”The wires will repel each other” option3=”There will be no force between the wires” option4=”There will be a force between the wires … <\/p>\n

Detailed SolutionTwo long wires each carrying a d.c. current in the same direction are<\/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":[1443,1201,1128],"class_list":["post-88131","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1443","tag-electric-current","tag-physics","no-featured-image-padding"],"yoast_head":"\nTwo long wires each carrying a d.c. current in the same direction are<\/title>\n<meta name=\"description\" content=\"When two parallel wires carry electric currents in the same direction, they produce magnetic fields that interact in such a way as to cause an attractive force between the wires. This is a fundamental principle of electromagnetism: Parallel currents in the same direction attract, and parallel currents in opposite directions repel.\" \/>\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\/two-long-wires-each-carrying-a-d-c-current-in-the-same-direction-are\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Two long wires each carrying a d.c. current in the same direction are\" \/>\n<meta property=\"og:description\" content=\"When two parallel wires carry electric currents in the same direction, they produce magnetic fields that interact in such a way as to cause an attractive force between the wires. 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