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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1996

  • question_answer
    The magnetic moment of a magnetic wire of length L is M. If the wire is bent in form of a semicircle its magnetic moment becomes:

    A)  \[\frac{2M}{\pi }\]                                         

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

    C)         \[M\]                                  

    D)         \[M\pi \]

    Correct Answer: A

    Solution :

    Magnetic moment \[M=m\times L\] On benting as a semicircle \[L=\pi r\] New magnetic moment \[M=m\times 2r\] \[=m\times \frac{2L}{\pi }=\frac{2M}{\pi }\]


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