Physics - Magnetism Question with Solution | TestHub

On bending a wire its pole strength remains unchanged whereas its magnetic length changes.

New magnetic moment,

$\mathrm{M}\text{'}=\mathrm{m}\times \left(2\mathrm{r}\right)=\genfrac{}{}{0.1ex}{}{\mathrm{m}\times 2\mathrm{l}}{\mathrm{\pi }}=\genfrac{}{}{0.1ex}{}{2\mathrm{M}}{\mathrm{\pi }}$