Flux changes with area.

The wire on the right is pulled to the right for 5 seconds and then to the left for 5 seconds as shown.  What is the magnitude of the magnetic field passing through the wire rectangle.  You may pause the simulation and read coordinate values by click-dragging the mouse at any time. The meter displays the induced emf in millivolts.  Start.

You can also plot V(t).

Script Example

<script language="JavaScript"> 
function prob(){
    document.Faraday.setDefault();
    document.Faraday.setFieldFunction("2");
    document.Faraday.setPosFunction("1.0+3.0*t+step(t-5)*(-6.0*(t-5))");
    document.Faraday.setMaxTime(10);
    document.Faraday.setCycle(true);
    document.Faraday.setPixPerUnit(20);
    document.Faraday.setShowGraph(false);
    document.Faraday.start();
}

function help(){
    document.Faraday.setDefault();
    document.Faraday.setFieldFunction("2");
    document.Faraday.setPosFunction("1.0+3.0*t+step(t-5)*(-6.0*(t-5))");
    document.Faraday.setMaxTime(10);
    document.Faraday.setCycle(true);
    document.Faraday.setPixPerUnit(9);
    document.Faraday.setShowGraph(true);
    document.Faraday.start();
}
</script>