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JEE Main & Advanced Physics Simple Harmonic Motion Question Bank Simple Pendulum

  • question_answer
    A simple pendulum is made of a body which a hollow sphere is containing mercury suspended by means of a wire. If a little mercury is drained off, the period of pendulum will            [NCERT 1972; BHU 1979]

    A)            Remains unchanged

    B)            Increase

    C)            Decrease

    D)            Become erratic

    Correct Answer: B

    Solution :

               When a little mercury is drained off, the position of c.g. of ball falls (w.r.t. fixed and) so that effective length of pendulum increases hence T increase.


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