A uniform, constant magnetic field $\vec B$ is directed at an angle of $45^o$ to the $x-$ axis in the $xy-$ plane, $PQRS$ is a rigid square wire frame carrying a steady current $I_0,$ with its centre at the origin $O.$ At time $t = 0,$ the frame is at rest in the position shown in the figure, with its sides parallel to the $x$ and $y$ axis. Each side of the frame is of mass $M$ and Length $L$
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$\tau=\vec {m} \times \vec{B}$
$=\mathrm{I}_{0} \mathrm{L}^{2} \hat{\mathrm{k}} \times\left(\frac{\mathrm{B}}{\sqrt{2}} \hat{\mathrm{i}}+\frac{\mathrm{B}}{\sqrt{2}} \hat{\mathrm{j}}\right)=\frac{\mathrm{I}_{0} \mathrm{L}^{2} \mathrm{B}}{\sqrt{2}}(\hat{\mathrm{j}}-\hat{\mathrm{i}})$
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