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NEET Sample Paper NEET Sample Test Paper-23

  • question_answer
    A bar magnet of length \[l\]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, \[M=ml\] \[\left( \begin{align}   & m=pole\,atrength \\  & I=length\,of\,magnet \\ \end{align} \right)\] According to question, \[I=\frac{\pi }{3}\times I\] So,       \[I=\frac{3l}{\pi }\] New magnetic moment, \[M'm\times 1\] \[=m\times \frac{3l}{\pi }=\frac{3}{\pi },ml\frac{3M}{\pi }\] Hence, the correction option is [b].


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