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].You need to login to perform this action.
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