3. Consider a uniformly charged ring with a total charge q. The plane of the ring is in the xy plane and has its center on the z axis. The potential at a distance z from the center of the ring and along the axial line is then given by the kq expression V2+ R where k is Coulomb's constant. Find the electric field if q = 3.00 JC, R = 1.80 m, and z = 0.350 m. (give both magnitude and direction)