Problem 3. A square loop of wire whose sides each have length a. lies in le my plane (centered at the origin] and carries a current I rurming counterclockwise as viewed from the positive ,2 axis. (a) {10 points] Determine the magnetic dipole moment of the loop. (b) [20 points] Determine the magnetic vector potential of the loop [in spherical coordinates). (c) {20 points] Use the magnetic vector potential to determine the magnetic eld produced by the loop (in spherical coordinates]