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 :

Options

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

Answer

A

Explanation

Time period `T=2pi sqrt((L)/(g))`
Effective length of the pendulum first increases and then decreases to the original value due to shifting of centre of gravity. So time period, first increases and then decreases. So correct choice is a.