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?
- APeriod decreases
- BPeriod does not change
- COscillations are damped
- DAmplitude increases
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