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 expression V = where k is Coulomb's constant. Use this information to find the electric field for q = 3.00 C, R = 1.70 m, and 2 kq z + R2 z = 0.700 m. N/C Additional Materials Reading