An iron rod of length $L$ and magnetic moment $M$ is bent in the form of a semicircle. Now its magnetic moment will be
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(b) On bending a rod it’s pole strength remains unchanged where as its magnetic moment changes.
New magnetic moment $M' = m(2R) = m\left( {\frac{{2L}}{\pi }} \right) = \frac{{2M}}{\pi }$
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