JEE Main & Advanced Physics Magnetism Question Bank Magnet and its Properties

  • question_answer
    A bar magnet of magnetic moment 200 A-m2 is suspended in a magnetic field of intensity 0.25 N/A-m. The couple required to deflect it through 30o is [AFMC 1999; Pb. PET 2000]

    A)            50 N-m                                   

    B)            25 N-m

    C)            20 N-m                                   

    D)            15 N-m

    Correct Answer: B

    Solution :

                       \[\tau =MB\sin \theta \]            \[\tau =200\times 0.25\times \sin 30{}^\circ =25\ N\times m.\]


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