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(C) The time period of a simple pendulum is given by $T = 2 \pi \sqrt{\frac{l}{g}}$,where $l$ is the effective length of the pendulum measured from th

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first increase and then decrease to the original value.

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(C) The time period of a simple pendulum is given by $T = 2 \pi \sqrt{\frac{l}{g}}$,where $l$ is the effective length of the pendulum measured from the point of suspension to the center of mass of the bob.Initially,the center of mass of the water-filled sphere is at its geometric center.As water drains out from the hole at the bottom,the center of mass of the system shifts downwards. This increases the effective length $l$,causing the time period $T$ to increase.As the water level continues to drop,the center of mass reaches its lowest point and then begins to rise back towards the geometric center of the sphere as the bob becomes empty.Once the water is completely drained,the center of mass returns to the geometric center of the hollow sphere,restoring the original effective length $l$ and thus the original time period $T$.

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:

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