1. When a bar magnet is kept in a uniform magnetic field it experiences no force.
2. The bar magnet experiences a torque $\vec{\tau}=\vec{M} \times \vec{B}$ The direction of torque is perpendicular to plane containing $\overrightarrow{ M }$ and $\overrightarrow{ B }$. This torque produces rotational motion of magnet.
3. $\tau=\tau_{\max }= mB$when $\theta=\frac{\pi}{2}$ The magnet experiences maximum torque when dipole moment vector is perpendicular to magnetic field.
4. $\tau=\tau_{\min }=0$ when $\theta=0$ or $\pi$. The magnet experiences minimum torque when dipole moment vector is parallel or antiparalled to magnetic field.

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