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Q.
A magnetised wire of moment $M$ and length $l$ is bent in the form of a semicircle of radius $r$ . Then its new magnetic moment is
NTA AbhyasNTA Abhyas 2020
Solution:
On bending a wire its pole strength remains unchanged whereas its magnetic length changes and $l=\pi r$ .
New magnetic moment,
$M'=m\times \left(2 r\right)=\frac{m \times 2 l}{\pi }=\frac{2 M}{\pi }$
