Chapter 21, Problem 3P

The rectangular loop in Fig. 21-5813 is being pushed to the right, where the magnetic field points inward. In what direction is the induced current? Explain your reasoning.

To determine

Answer to Problem 3P

Direction of induced current in the rectangular loop.

Solution:

Explanation of Solution

The induced current flows in anti-clockwise direction.

According to Lenz’s law, if the motion of the loop is such that the flux linked with it increases, the induced current will flow in the direction so as to oppose the change that is the induced current should produce magnetic field in the opposite direction (directed out of the plane of the paper). This requires the induced current to flow in the anticlockwise sense.

Conclusion:

Direction of induced current in a circuit is such that it opposes the cause or the change which produces it.