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AFMC AFMC Solved Paper-2006

  • question_answer
    A simple pendulum is made of a body which is a hollow sphere containing mercury suspended by means of a wire. If a little mercury is drained off, the period of pendulum will:

    A) remain unchanged         

    B) increase

    C) decrease                            

    D) become erratic

    Correct Answer: B

    Solution :

    Length of simple pendulum =Distance between point of suspension and centre of gravity of system On draining off a little mercury, the centre of gravity gets lowered, that is, the length of simple pendulum increases. The time period of simple pendulum is given by              \[T=2\pi \sqrt{\frac{l}{g}}\] \[\Rightarrow \]         \[T\propto \sqrt{l}\] As length of simple pendulum increases, the time period increases.


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