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

  • question_answer
    A circular coil of one turn and area A carrying a current has a magnetic dipole moment M. The current through the coil is:

    A) \[MA\]                          

    B) \[\frac{A}{M}\]

    C) \[\frac{M}{A}\]                         

    D) \[\frac{M}{{{A}^{2}}}\]

    Correct Answer: C

    Solution :

    (c) \[\frac{M}{A}\] We know that   \[M=NlA\] \[\Rightarrow l=\frac{M}{NA}=\frac{M}{1\times A}\]       (Given that N = 1) \[\Rightarrow l=\frac{M}{A}.\]


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