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

  • question_answer
    A simple pendulum of length l has a brass bob attached at its lower end. Its period is T. If a steel bob of same size, having density x times that of brass, replaces the brass bob and its length is changed so that period becomes 2T, then new length is                                                              [MP PMT 2002]

    A)            2 l  

    B)            4 l

    C)            4 l x                                          

    D)            \[\frac{4l}{x}\]

    Correct Answer: B

    Solution :

               \[T\propto \sqrt{l}\] Time period depends only on effective length. Density has no effect on time period. If length made 4 times then time period becomes 2 times.


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