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NEET NEET SOLVED PAPER 2013

  • question_answer
    A bar magnet of length I and magnetic dipole moment M is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be 

    A)  M

    B) \[\frac{3}{\pi }M\]

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

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

    Correct Answer: B

    Solution :

    The magnetic moment, M = ml From figure \[l=\frac{\pi }{3}\times r\]or \[r=\frac{3l}{\pi }\] \[\therefore \]New magnetic moment \[M'=m\times r\] \[=m\times \frac{3l}{\pi }=\frac{3}{\pi }.ml=\frac{3M}{\pi }\]


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