1. The problem statement, all variables and given/known data A ring of charge is situated in the x‐y plane centered about the origin. The ring has a uniformly distributed charge Q = ‐10 nC and a radius R = 2.0 cm. a. Find the electric potential at a distance z = 5.0 cm above the origin on the z=axis. b. Find the electric field at a distance z = 5.0 cm above the origin on the z=axis. c. Find the speed of a proton as it passes through the origin assuming that it is released from rest at z=5.0 cm. 2. Relevant equations λ=Q/l dl=RdΘ dq=λdl E(z)=KQx/(x^2+R^2)^3/2 U= KQq/r 3. The attempt at a solution After solving to get this b) E(z)=KQx/(x^2+R^2)^3/2 =(8.998x10^9)(10x10^-6)(0.05m) / (0.05^2+0.02^2)^3/2 =2.88x10^7 N/C Now I feel like this is really easy to get a, but I can't seem to get it. And c is just blew my mind.