The bob of 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 decreased and then increase to the original value
B. first increase and then decrease to the original value
C. remain unchanged
D. increase towards a saturation value

Answer

B

Explanation

`T lt T_(1) gt (T_(2) = T)`

`T = 2pi sqrt((l)/(g)) , T = 2pi sqrt((l+Deltal)/(g))`

`T_(2) = 2pi sqrt((l)/(g)) = T.`
and `T_(1) gt T_(2)`
Hence, time period first increases and then decreases to the original value.