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JEE Main & Advanced Physics Magnetism Question Bank Magnetic Equipments

  • question_answer
    Using a bar magnet P, a vibration magnetometer has time  period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true         [MP PMT 1995]

    A)            Q is of non-magnetic material

    B)            Q is a bar magnet identical to P, and its north pole placed on top of P's north pole

    C)            Q is of unmagnetized ferromagnetic material

    D)            Nothing can be said about Q's properties

    Correct Answer: B

    Solution :

               \[T=2\pi \sqrt{\frac{I}{M{{B}_{H}}}}\]. If Q is an identical bar magnet then time period of system will be \[{T}'=2\pi \sqrt{\frac{2I}{(2M){{B}_{H}}}}=T\]


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