Magnetism and Matter Questions

Above Curie temperature :

A magnetic needle suspended parallel to a magnetic field requires $\sqrt{3}\text{J}$ of work to turn it through $60^{\circ }$. The torque needed to maintain the needle in this position will be:

The magnetic susceptibility is negative for:

A bar magnet is hung by a cotton thread in a horizontal magnetic field and is in equilibrium. The energy required to rotate it by $60^{\circ }$ is $W$. Now the torque required to keep the magnet in this new position is: