All parts please

(8) [5 points] Consider a square loop of massless wire with side length a, and current I. The loop is suspended in a uniform magnetic field B pointing I pivot in the vertical direction. The loop pivots around one horizontal side, and a small mass m hangs from the opposite horizontal side. (a) Find the angle 0 at which the loop is in equilibrium. Hint: require the net torque on the loop to be zero, a static equilibrium problem. (b) What happens if the direction of the current in the loop is reversed? Answer in words and a sketch. Magnetic Field m