Chapter 30, Problem 42AP

Review. In Figure P30.42, a uniform magnetic field decreases at a constant rate dB/dt = −K, where K is a positive constant. A circular loop of wire of radius a containing a resistance R and a capacitance C is placed with its plane normal to the field. (a) Find the charge Q on the capacitor when it is fully charged. (b) Which plate, upper or lower, is at the higher potential? (c) Discuss the force that causes the separation of charges.

Figure P30.42