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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 36

  • question_answer
    A magnet is suspended horizontally in the earth's magnetic field. When it is displaced and released, it oscillates in a horizontal plane with a period T. If a piece of wood of same M.I as the magnet is attached to the magnet is attached to the magnet, the new period of oscillation of the system would be -

    A) \[\frac{T}{3}\]              

    B)        \[\frac{T}{2}\]

    C) \[\frac{T}{\sqrt{2}}\]                 

    D)        \[\sqrt{2}T\]

    Correct Answer: D

    Solution :

    [d] \[T=2\pi \sqrt{\frac{I}{M{{B}_{H}}}}\] \[T=2\pi \sqrt{\frac{2I}{M{{B}_{H}}}}\] \[=\sqrt{2}T\]


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