The maximum torque acting on a magnet in a field of induction 0.2 tesla is 10 N-m. What is the magnetic moment?

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Solution

Magnetic field of induction, $B = 0.2$ $T$
Maximum torque acting in magnet, $τ_{m} = 10$ $N - m$
Maximum magnetic torque acting on a magnet, $τ_{m} = M B$ where $M$ is the magnetic moment
$⟹$ $M = \frac{τ_{m}}{B}$
$∴$ $M = \frac{10}{0.2} = 50$ $A m^{2}$

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