please answer the questions below.

Athin nonconducting rod with a uniform distribution of positive charge Q is bent into a circle of radius R (see the gure}.The central perpendicular axis through the ring is a z axis, with the origin at the center of the ring.What is the magnitude of the electric eld due to the rod at {a} z = 0 and [bi z = c>D? [cl In terms of Rr at what positivevalue ofz is that magnitude maximum? (d) If R = 2.33 cm and Q = 4.30 pC,what is the maximum magnitude? [a] Number [cl Number [bl Number \"0 [d1 Number Units _ v_