A magnetic rod with length 6.00 cm, radius 3.00 mm, and (uniform) magnetization 2.70 x 10 3 A/m can...

A magnetic rod with length 6.00 cm, radius 3.00 mm, and (uniform) magnetization 2.70 x 10³ A/m can turn about  its center like a compass needle. It is placed in a uniform magnetic field  of magnitude 35.0 mT, such that the directions of its dipole moment and  make an angle of 68.0°. (a) What is the magnitude of the torque on the rod due to ? (b) What is the change in the magnetic potential energy of the rod if the angle changes to 34.0°?