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The ring radius is b with positive line density, rho sub l. A segment of the ring has length d l equals b d phi represented by 1. An angle phi is labeled from the x axis to the radius of the ring. A Point P, (0, 0, h) on the z axis is at a distance h from the origin. The distance vector R sub 1 prime is drawn from segment 1 to the point P. The charge produces three electric fields on the point P that are, d E sub 1 r, d E sub 1 in the x z plane and d E sub 1 z on the z axis.