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A cylindrical bar magnet is lying along the axis of a circular coil. If the magnet is rotated about the axis of the coil then

1. emf will be induced in the coil
2. only induced current will be generate in the coil
3. no current will be induced in the coil
4. both emf and current will be induced in the coil

Correct answer: no current will be induced in the coil

Solution

When the magnet is rotated about the same axis as the coil, the magnetic flux through the coil remains constant. Since induced emf depends on change in flux, no emf is produced and therefore no current flows.

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