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style="margin-bottom: 10px"><i class="fa fa-send"></i> Feedback</button> </div> </div> <div class="col-md-9" id="main-column"> <h1 class="page_title"> Electromagnets <a href="#" class="mark-page-favorite pull-right" data-pid="347" title="Mark as favorite" onclick="return false;"><i class="fa fa-star-o"></i></a> </h1> <ol class="breadcrumb"> <li><a href="../../../physics.html"><i class="fa fa-home"></i></a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><a href="../445/electricity-and-magnetism.html">Electricity and magnetism</a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><a href="../345/magnetic-fields.html">Magnetic fields</a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><span class="gray">Electromagnets</span></li> <span class="pull-right" style="color: #555" title="Suggested study time: 5 minutes"><i class="fa fa-clock-o"></i> 5'</span> </ol> <article id="main-article"> <p><img alt="" src="../../electricity/17-pylon.jpg" style="float: left; width: 167px; height: 250px;">Moving charges (e.g. in any electric circuit!) produce a magnetic field.</p> <p><img class="sibico" src="../../../img/sibico/tok.svg" style="height:1.25em;width: auto;vertical-align:text-bottom" title="Theory if Knowledge"> The connection between electricity and magnetism is said to have been discovered by chance by physicist Hans Christian Oersted. It is possible that John Brown the baker had already noticed it. Would this count as a discovery?</p> <hr class="hidden-separator"> <div class="panel panel-turquoise panel-has-colored-body"> <div class="panel-footer"> <div> </div> </div> </div> <div class="panel panel-has-colored-body panel-yellow"> <div class="panel-heading"><a class="expander" href="#"><span class="fa fa-plus"></span></a> <div> <p>Essentials</p> </div> </div> <div class="panel-body"> <div> <div class="panel panel-has-colored-body panel-has-border panel-yellow"> <div class="panel-heading"><a class="expander" href="#"><span class="fa fa-plus"></span></a> <div> <p>Straight wire</p> </div> </div> <div class="panel-body"> <div> <p>The magnetic field around a current-carrying straight conductor forms concentric circles. The direction of the field is found using the <em>right hand grip rule</em>.</p> <div class="video-embed vimeo"><iframe allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" mozallowfullscreen="" webkitallowfullscreen="" height="420" width="100%" src="https://player.vimeo.com/video/172226222"></iframe></div> </div> </div> <div class="panel-footer"> <div> <p> </p> </div> </div> </div> <div class="panel panel-has-colored-body panel-has-border panel-yellow panel-expandable"> <div class="panel-heading"><a class="expander" href="#"><span class="fa fa-plus"></span></a> <div> <p>Loops of wire</p> </div> </div> <div class="panel-body"> <div> <p>See how to add the fields of each loop of coil when forming a solenoid.</p> <div class="video-embed vimeo"><iframe allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" mozallowfullscreen="" webkitallowfullscreen="" height="420" width="100%" src="https://player.vimeo.com/video/172228386"></iframe></div> </div> </div> <div class="panel-footer"> <div> <p> </p> </div> </div> </div> </div> </div> </div> <div class="panel panel-has-colored-body panel-green"> <div class="panel-heading"><a class="expander" href="#"><span class="fa fa-plus"></span></a> <div> <p>Test Yourself</p> </div> </div> <div class="panel-body"> <div> <p><i>Use quizzes to practise application of theory.</i> </p> <br><a class="btn btn-primary btn-block text-center" data-toggle="modal" href="#8849f62e"><i class="fa fa-play"></i> START QUIZ!</a><div class="modal fade modal-slide-quiz" id="8849f62e"> <div class="modal-dialog" style="width: 95vw; max-width: 960px"> <div class="modal-content"> <div class="modal-header slide-quiz-title"> <h4 class="modal-title" style="width: 100%;"> Moving charges in magnetic fields <strong class="q-number pull-right"> <span class="counter">1</span>/<span class="total">1</span> </strong> </h4> </div> <div class="modal-body p-xs-3"> <div class="slide-quiz" data-stats="6-104-347" style="opacity: 0"> <div class="exercise shadow-bottom"><div class="q-question"><p>An electron moves at 400ms<sup>-1</sup> in a perpendicular magnetic field of flux density 10 mT.</p><p>The magnitude of the force it experiences is:</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> 4000 N</label></p><p><label class="radio"><input type="radio"> 6.4 x 10 <sup>-16 </sup> N</label></p><p><label class="radio"><input class="c" type="radio"> 6.4 x 10<sup>-19</sup> N</label></p><p><label class="radio"><input type="radio"> 4 N</label></p></div><div class="q-explanation"><p>F = Bqv = 10 x 10 <sup>-3</sup> x 1.6 x 10 <sup>-19 </sup>x 400</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>An electron passes into a region of uniform magnetic field.</p><p style="text-align: center;"><img alt="" src="../../mc-images/bq1.jpg" style="width: 467px; height: 466px;"></p><p>Which track shows the possible path of the particle.</p></div><div class="q-answer"><p><label class="radio" style=" float: left; margin-right: 40px; "><input class="c" type="radio"> D</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> A</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> B</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> C</label></p></div><div class="q-explanation"><p>The force will be initially down then always perpendicular to the motion.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>Two particles are projected into a perpendicular magnetic field. The particles have the same charge and velocity but particle A has twice the mass of particle B. Each particle travels in a circular path.</p><p>The ratio radius of path A / radius path B</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> 0.5</label></p><p><label class="radio"><input type="radio"> 1</label></p><p><label class="radio"><input type="radio"> 4</label></p><p><label class="radio"><input class="c" type="radio"> 2</label></p></div><div class="q-explanation"><p>The radius is proportional to mass so particle A will have a path of 2 x radius of B</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The diagram shows the path of a charged particle in a perpendicular magnetic field-</p><p style="text-align: center;"><img alt="" src="../../mc-images/bq3.jpg" style="width: 376px; height: 338px;"></p><p>Which of the following statements gives a possible scenario?</p></div><div class="q-answer"><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> A negative particle losing energy as it travels from A to B</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> A positive particle gaining energy as it travels from A to B</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input class="c" type="radio"> A positive particle losing energy as it travels from A to B</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> A negative particle losing energy as it travels from B to A</label></p></div><div class="q-explanation"><p>As the particle loses KE its velocity gets less so the radius of circle is reduced. A + particle travelling from A to B has the correct force direction</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>A particle of mass m and velocity v travels in a circular path of radius r in a magnetic field of flux density B.</p><p>The radius of the path is given by the equation</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> mv<sup>2</sup>/Bq</label></p><p><label class="radio"><input type="radio"> mvq/B</label></p><p><label class="radio"><input class="c" type="radio"> mv/Bq</label></p><p><label class="radio"><input type="radio"> Bq/mv</label></p></div><div class="q-explanation"><p>centripetal force = magnetic force</p><p>mv<sup>2</sup>/r = Bqv</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The particles that form the aurora:</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> travel along the magnetic field lines</label></p><p><label class="radio"><input type="radio"> travel perpendicular to the magnetic field lines</label></p><p><label class="radio"><input class="c" type="radio"> spiral around the magnetic field lines.</label></p><p><label class="radio"><input type="radio"> travel in an opposite direction to the magnetic field lines</label></p></div><div class="q-explanation"><p>more of a spiraling helix but spiraling is the best answer.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The unit of flux density is the Tesla.</p><p>An alternative unit could be:</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> NCms<sup>-1</sup></label></p><p><label class="radio"><input type="radio"> NC<sup>-1</sup></label></p><p><label class="radio"><input class="c" type="radio"> NC<sup>-1</sup>m<sup>-1</sup>s</label></p><p><label class="radio"><input type="radio"> N<sup>-1</sup>Cms<sup>-1</sup></label></p></div><div class="q-explanation"><p>F = Bqv</p><p>B = F/qv =N/Cms<sup>-1</sup></p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The diagram represents an electron travelling into a magnetic field.</p><p style="text-align: center;"><img alt="" height="175" src="../../mc-images/img_0065.jpg" width="223"></p><p>Which of the following represents a possible path</p><p style="text-align: center;"><img alt="" height="136" src="../../mc-images/img_0066.jpg" width="248"></p></div><div class="q-answer"><p><label class="radio" style=" float: left; margin-right: 40px; "><input class="c" type="radio"> B</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> A</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> C</label></p><p><label class="radio" style=" float: left; margin-right: 40px; "><input type="radio"> D</label></p></div><div class="q-explanation"><p>As the field gets weaker the radius gets larger so the electron takes longer to complete each circle.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div><div class="exercise shadow-bottom"><div class="q-question"><p>The Aurora Borealis is only seen in the winter because</p></div><div class="q-answer"><p><label class="radio"><input type="radio"> The sun is most active in the winter</label></p><p><label class="radio"><input type="radio"> It only occurs when the weather is cold</label></p><p><label class="radio"><input type="radio"> There are less clouds in the winter</label></p><p><label class="radio"><input class="c" type="radio"> The nights are too light in the summer</label></p></div><div class="q-explanation"><p>If you live in Norway you will know that the nights are not dark in the summer.</p></div><div class="slide-q-actions"><button class="btn btn-default btn-sm btn-xs-block text-xs-center check"><i class="fa fa-check-square-o"></i> Check</button></div></div> </div> </div> <div class="modal-footer slide-quiz-actions"> <div class=""> <div class="pull-left pull-xs-none mb-xs-3"> <button class="btn btn-default d-xs-none btn-prev"> <i class="fa fa-arrow-left"></i> Prev </button> </div> <div class="pull-right pull-xs-none"> <button class="btn btn-success btn-xs-block text-xs-center btn-results" style="display: none"> <i 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