With a steady external magnetic field in the +z direction, a conducting loop in the x-y plane is rotated slightly about the y axis. What is the direction of the induced current in the loop during rotation?

A) Clockwise

B) Counterclockwise

C) Zero

D) Depends

Solution: B. The flux begins as the maximum possible for a given loop and magnetic field. As the loop is rotated, the flux decreases. Since the flux decreases, the external field (+z) and the induced field (+z) must be in the same direction. The current must be counterclockwise by the right-hand rule. This solution actually does not depend on which way the loop is rotated.