A simple pendulum is made of a body which is a hollow sphere containing mercury, suspended by means of a wire. If a little mercury is drained off, then the time period of pendulum

Decrease

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Increase

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Remains unchanged

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Become erratic

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Solution

The correct option is B Increase
When the mercury inside the hollow sphere is drained off, the position of centre of mass of (ball+mercury) falls (with respect to fixed end) such that, the effective length of pendulum increases hence $T$ increases.

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