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JEE Main & Advanced Sample Paper JEE Main Sample Paper-33

  • question_answer
    A bar magnet of magnetic moment M is bent in the form of quadrant of circular arc. The new magnetic moment is:

    A)  \[\frac{2M}{\pi }\]         

    B)     \[\frac{2\sqrt{2}}{\pi }M\]

    C)  \[\frac{\sqrt{2}}{\pi }M\]            

    D)     \[\frac{4\sqrt{2}}{\pi }M\]

    Correct Answer: D

    Solution :

    \[M=m\times l,\,\,l=\frac{\pi }{4}\,R,\,\,M'\,=mR\sqrt{2}=m\]             \[=\,\frac{4M}{\pi }\sqrt{2}\]


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