A bar magnet, of magnetic moment M', is placed in a magnetic

Home » Electricity and Magnetism » Magnetism and Matter » Question

A bar magnet, of magnetic moment M', is placed in a magnetic field of induction B'. The torque exerted on it is

1. M^{^→} . B^{^→}
2. - M^{^→} . B^{^→}
3. M^{^→} × B^{^→}
4. B^{^→} × M^{^→}

Correct Option: C

We know that when a bar magnet is placed in the magnetic field at an angle θ, then torque acting on the bar magnet (τ) = MB sin θ = M^{^→} × B^{^→}.
Note : This torque τ has a tendency to make the axis of the magnet parallel to the direction of the magnetic field.