College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 74

A bar magnet is held stationary while a circular loop of wire is moved toward the magnet at constant velocity at position A as in Figure P20.26. The loop passes over the magnet at position B and moves away from the magnet at position C. Find the direction of the induced current in the loop using Lenz's law (a) at position A and (b) at position C. (c) What is the induced current in the loop at position B Explain.