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12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
    A current carrying Loop is free to turn in a uniform magnetic field. The loop will then come to quilibrium when its place is inclined at:

    A) \[90{}^\circ \] to the direction of field

    B) \[0{}^\circ \] to the direction of field

    C) \[45{}^\circ \]to the direction of field

    D) \[135{}^\circ \] to the direction of field

    Correct Answer: B

    Solution :

    (b) \[0{}^\circ \] to the direction of field.                               A stable equilibrium is when the net torque on the loop is minimum. It is when the magnetic moment of the loop is along the direction of field. i. e., \[\theta =0{}^\circ \] \[\Rightarrow \tau =MB\,\sin \theta =MB\,\sin 0{}^\circ =0\].


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