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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Electric Field and Potential

  • question_answer
    A simple pendulum of period \[T\] has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will                                                                     [AIEEE 2002; CBSE PMT 2001]

    A)            Remains equal to T            

    B)            Less than \[T\]

    C)            Greater than \[T\]

    D)                                      Infinite

    Correct Answer: B

    Solution :

                 When a negatively charged pendulum oscillates over a positively charged plate then effective value of g increases so according to \[T=2\pi \sqrt{\frac{l}{g}},\] T decreases.


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