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

  • question_answer
    A circular current loop of magnetic moment M is in an arbitrary orientation in an external magnetic field \[\overrightarrow{B}\]. The work done to rotate the loop by \[30{}^\circ \] about an axis prependicular to its plane is:            [NCERT EXEMPLAR]

    A) \[MB\]                          

    B) \[\sqrt{3}\frac{MB}{2}\]

    C) \[\frac{MB}{2}\]                                   

    D) zero

    Correct Answer: D

    Solution :

    (d) zero Rotation of loop by \[30{}^\circ \] about an axis perpendicular to its plane does not change the angle between magnetic moment and magnetic field. Hence, no work is done.


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