Solution:
On draining of a little mercury the centre of gravity gets lowered so l increases.
so time period increases.
A simple pendulum is made of a bob which is a hollow sphere fulI of mercury suspended by means of a wire. If a little mercury is drained off, the period of the pendulum will:
A simple pendulum is made of a bob which is a hollow sphere fulI of mercury suspended by means of a wire. If a little mercury is drained off, the period of the pendulum will:
