12th Class Physics Magnetism Question Bank Assertion And Reason (MCQs) - Magnetism and Matter

  • question_answer
    ASSERTION: Torque experience by the bar magnet is maximum when field is applied perpendicular to magnetic moment.
    REASON: Torque on a bar magnet depends on the angle between applied magnetic field and magnetic dipole moment.

    A) If both assertion and reason are true and reason is the correct explanation of assertion.

    B) If both assertion and reason are true and reason is not the correct explanation of assertion.

    C) If assertion is true but reason is false.

    D) If both assertion and reason are false.

    E) If assertion is false but reason is true.

    Correct Answer: A

    Solution :

    The torque on a bar magnet is given by \[\tau =MB\,\sin \theta \] Where M = magnetic dipole moment, B = uniform magnetic field. When \[\theta =90{}^\circ \]then magnitude of the torque is maximum.


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