Physics - Magnetism Question with Solution | TestHub

Magnetic wire of length $l$ has magnetic moment $M$, therefore $M=ml$ where, $\mathrm{m}$ is the strength of each monopole. If it is bent into $l$ shape the effective separation between the monopoles changes to $\frac{l}{\sqrt{2}}$. Therefore, new magnetic moment is: $M^{\prime }=m\left(\frac{l}{\sqrt{2}}\right)=\frac{M}{\sqrt{2}}$