A student placed a rectangular loop carrying current in between the pole pieces of two magnetics and found that the loop is rotating : What is the net force on the loop?

A student placed a rectangular loop carrying current in between the pole pieces of two magnetics and found that the loop is rotating. At what position will the coil be in stable equilibrium?

A rectangular loop of area A and carrying a steady current I is placed in a uniform magnetic field:-Derive the expression of torque, tau = barmxxbarB acting on the loop.