Lenz's law: A circular loop of wire lies in the plane of the paper. An increasing magnetic field points out of the paper. What is the direction of the induced current in the loop?
A) counter-clockwise then clockwise
B) clockwise then counter-clockwise
C) clockwise
D) counter-clockwise
E) There is no current induced in the loop.

Question

Quizplus · Accepted Answer

Lenz's law states that the direction of the induced current will be such that it opposes the change in magnetic flux. In this case, to oppose an increasing magnetic field pointing out of the paper, the induced current must create its own magnetic field pointing into the paper. This is achieved with a clockwise current when viewed from above.

Lenz's Law: a Circular Loop of Wire Lies in the Plane