A magnet of magnetic moment $50\,\hat i\,A{\rm{ - }}{m^2}$ is placed along the $x-$ axis in a magnetic field $\overrightarrow B = (0.5\,\hat i + 3.0\hat j)\,T.$ The torque acting on the magnet is
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(b)$\overrightarrow \tau = \overrightarrow M \times \overrightarrow B \Rightarrow \overrightarrow \tau = 50\hat i \times (0.5\hat i + 3\hat j)$
$ = 150\left( {\hat i \times \hat j} \right) = 150\,\hat k\,N \times m.$
$ = 150\left( {\hat i \times \hat j} \right) = 150\,\hat k\,N \times m.$
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