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

  • question_answer
    The magnetic moment of a current l carrying circular coil of radius r and number of turns N varies as:

    A) \[\frac{1}{{{r}^{2}}}\]                        

    B) \[\frac{1}{r}\]

    C) \[r\]                              

    D) \[{{r}^{2}}\]

    Correct Answer: D

    Solution :

    (d) \[{{r}^{2}}\] Magnetic Moment. \[M=NIA=NI\pi {{r}^{2}}\] \[\Rightarrow M\propto {{r}^{2}}\].


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