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The bob of a simple pendulum is a spheri...

The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly unplugged. During observation, till water is coming out, the time period of oscillation would.

A

first increase and then decrease to the original value

B

first decrease and then increase to the original value

C

remain unchanged

D

increase towards a saturation value

Text Solution

Verified by Experts

The correct Answer is:
A
The expression of time period of a simple pendulum
`T = 2pisqrt((l_(eff))/(g_(eff)))`
Where `l_(eff)` is the distance between point of suspension and centre of gravity of bob. As the hole is suddenly unplaugged, `l_(eff)` first increases then decrease because of shifting of CM due to which the time period first increases and then decreases to the original value.
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ALLEN -SIMPLE HARMONIC MOTION-Exercise-05 [A]
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