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A metallic ring is attached to the wall of a room. When the north pole of a magnet is brought near it, the induced current in the ring will be

1. First clockwise then anticlockwise
2. In clockwise direction
3. In anticlockwise direction
4. First anticlockwise then clockwise

Correct answer: In anticlockwise direction

Solution

When the north pole approaches the ring, magnetic flux through the ring increases. By Lenz’s law, the induced current must oppose this increase, so the face of the ring near the magnet becomes a north pole. Using the right-hand rule, this corresponds to an anticlockwise current as seen from the magnet side.

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