College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 56

A circular loop of wire of resistance R = 0.500 V and radius r = 8.00 cm is in a uniform magnetic field directed out of the page as in Figure P20.54. If a clockwise current of I = 2.50 mA is induced in the loop, (a) is the magnetic field increasing or decreasing in time (b) Find the rate at which the field is changing with time.