(b) Determine the work required to transfer a total charge Q from one plate to the other in such a capacitor when it is initially charge-free.

(a) A conducting bar of length L has one end connected to a pivot, and the other end is connected to a conducting ring around the pivot. A magnetic field is directed perpendicular into the ring and varies with the distance r to the pivot by B(r) = 2r. If the rod rotates with a constant angular speed ω about the pivot, what is the induced motional electromotive force between the ring and the pivot?

題組內容

(b) Determine the work required to transfer a total charge Q from one plate to the other in such a capacitor when it is initially charge-free.

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