JEE Main & Advanced Physics Magnetism Question Bank Magnetic Equipments

  • question_answer A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased by 500°C, then                                                           [MNR 1994]

    A)            The time period decreases

    B)            The time period remains unchanged

    C)            The time period increases

    D)            The needle stops vibrating

    Correct Answer: C

    Solution :

               \[T\propto \frac{1}{\sqrt{M}}\]. Since magnetic moment decreases with increase in temperature hence time period T increases.

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