Chapter 21, Problem 14P

A solenoid carrying a current i is moving toward a metal ring, as shown in Figure 21.50. In what direction, clockwise or counterclockwise (as seen from the solenoid), is a current induced in the ring? In what direction will the induced current be if the solenoid now stops moving toward the ring, but the current in it begins to decrease?

Figure 21.50

Problem 14.