A metallic circular ring is suspended by a string and is kept in a vertical plane. When a magnet is approached towards the ring, then it will :

remain stationary

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get displaced away from the magnet

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get displaced towards the magnet

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nothing can be said

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Solution

The correct option is B get displaced away from the magnet
As the magnet is brought closer, the magnetic flux through the ring changes. By Lenz's law a current will be induced in the ring that produces its own magnetic field which opposes the change in flux through the the ring. Therefore the induced magnetic field opposes the the field of the magnet. And hence, due to repulsion the ring moves away from the approaching field.

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