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 unplugg
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 lscillation 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
1 Answers
Correct Answer - 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.