{"id":593,"date":"2023-08-18T12:48:07","date_gmt":"2023-08-18T19:48:07","guid":{"rendered":"https:\/\/dornsife.usc.edu\/lecture-support-lab\/?page_id=593"},"modified":"2023-08-18T12:48:08","modified_gmt":"2023-08-18T19:48:08","slug":"magnetic-effects-of-current","status":"publish","type":"page","link":"https:\/\/dornsife.usc.edu\/lecture-support-lab\/magnetic-effects-of-current\/","title":{"rendered":"Magnetic Effects of Current"},"content":{"rendered":"\n\n\n\n      \n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--accordions \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--accordions\"\n    \n      >\n\n    \n  \n      <ul>\n              <li>\n          <button type=\"button\" class=\"accordion-trigger \" id=\"heading-1-1-QJpqdsYT-L\" aria-controls=\"section-1-1-QJpqdsYT-L\" aria-expanded=\"false\" aria-disabled=\"false\">\n                          <span class=\"item-title\">EM.1(1) &#8211; Oersted&#8217;s law Apparatus<\/span>\n            \n                      <\/button>\n\n          <div id=\"section-1-1-QJpqdsYT-L\" role=\"region\" aria-labelledby=\"heading-1-1-QJpqdsYT-L\" class=\"accordion-panel\">\n\n                            \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>This apparatus consists of a thick wire bent and set standing on a support. A small compass needle is set close to the wire and it is free to move on its plane. On the supporting plate there are connectors for the power supply. When a current runs through the wire, the com\u00adpass needle is deflected, illustrating the mag\u00adnetic effects of current flowing in a wire. One set can be used with the overhead projector.<\/p>\n<p>No deflection is observed if the compass needle is placed near to and at right angles to the current carrying wire. That was how H.C. Oersted used to demonstrate in his lectures at the University of Copenhagen the non-existence of a connection between electricity and magnetism. Until the day that a student asked him what would happen if the needle were placed parallel to the wire.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-594 aligncenter\" src=\"https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_1.jpg\" alt=\"Oersted's law Apparatus\" width=\"288\" height=\"163\" \/><\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n            \n                      <\/div>\n        <\/li>\n\n              <li>\n          <button type=\"button\" class=\"accordion-trigger \" id=\"heading-1-2-QJpqdsYT-L\" aria-controls=\"section-1-2-QJpqdsYT-L\" aria-expanded=\"false\" aria-disabled=\"false\">\n                          <span class=\"item-title\">EM.1(2) &#8211; Magnetic Field about a Wire &#8211; Compass Board<\/span>\n            \n                      <\/button>\n\n          <div id=\"section-1-2-QJpqdsYT-L\" role=\"region\" aria-labelledby=\"heading-1-2-QJpqdsYT-L\" class=\"accordion-panel\">\n\n                            \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>A wire runs perpendicular to a clear Plexiglas\u2019s plate. The plate has small compasses placed on sharp pins attached radially around the wire. When the wire carries a current, the magnetic field around the wire will be detected by the compasses. A switch connected to the circuit allows one to change the current direction and observe the correspondent change on the compasses needle&#8217;s orientation. It is done on the overhead projector enabling the whole class to observe it. For a well-defined effect, a coil of about 15 loops is used instead of a single wire.<\/p>\n<p>One could also sprinkle iron fillings over the plate and observe how the iron bits group themselves closer to the wire where the field is stronger.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-595 aligncenter\" src=\"https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_2-300x190.jpg\" alt=\"Magnetic Field about a Wire - Compass Board\" width=\"300\" height=\"190\" srcset=\"https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_2-300x190.jpg 300w, https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_2.jpg 324w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n            \n                      <\/div>\n        <\/li>\n\n              <li>\n          <button type=\"button\" class=\"accordion-trigger \" id=\"heading-1-3-QJpqdsYT-L\" aria-controls=\"section-1-3-QJpqdsYT-L\" aria-expanded=\"false\" aria-disabled=\"false\">\n                          <span class=\"item-title\">EM.1(3) &#8211; Magnetic Field about Two Parallel Wires<\/span>\n            \n                      <\/button>\n\n          <div id=\"section-1-3-QJpqdsYT-L\" role=\"region\" aria-labelledby=\"heading-1-3-QJpqdsYT-L\" class=\"accordion-panel\">\n\n                            \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>Iron fillings reveal the magnetic field lines in the plane perpendicular to two parallel wires. Different patters emerge when the currents in the two wires travel in the same or opposite directions.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-596 aligncenter\" src=\"https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_3a-300x216.jpg\" alt=\"Magnetic Field about Two Parallel Wires\" width=\"300\" height=\"216\" srcset=\"https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_3a-300x216.jpg 300w, https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_3a.jpg 360w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/> <\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-597 aligncenter\" src=\"https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_3b-300x225.jpg\" alt=\"Magnetic Field about Two Parallel Wires\" width=\"300\" height=\"225\" srcset=\"https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_3b-300x225.jpg 300w, https:\/\/dornsife.usc.edu\/lecture-support-lab\/wp-content\/uploads\/sites\/280\/2023\/08\/em1_3b.jpg 360w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n            \n                      <\/div>\n        <\/li>\n\n          <\/ul>\n  \n  \n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":354,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-content-detail.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-593","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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