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Q.

The bob of a simple pendulum is replaced by a magnet. The oscillations are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is short-circuited. Then which one of the following happens?

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a

Time period does not change.

b

Time period of oscillations decreases.

c

Amplitude of oscillations increases.

d

Oscillations are damped.

answer is C.

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Detailed Solution

The oscillations are damped and this is due to the magnetic field produced by coil.

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