21.61.Set Up:Wires Aand Chave a length of 0.500 m and wire Dhas a length of where vis the component of velocity perpendicular to the field direction and perpendicular to the bar.Solve: (a)is parallel to so the induced emf is zero.(b)is perpendicular to The component of perpendicular to the bar is (c)is perpendicular to The component of perpendicular to the bar is Reflect:The induced emf depends on the angle between and and also on the angle between and the bar.21.62.Set Up:The energy stored in a capacitor is The energy stored in an inductor is Energy conservation requires that the total stored energy be constant. The current is a maximum when the charge onthe capacitor is zero.Solve: (a)At this instant (b)At this instant (c)This is when 21.63.Set Up:Use to find the amount of heat energy that must go into the water. The energy stored inan inductor is Solve:This much energy must be stored inthe inductor, so This is a huge current; not reasonable for ordinary inductors.
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Magnetic Field, Inductor, Faraday's law of induction