Question: A ring with radius R and a uniformly distributed total charge Q lies in the xy plane, centered at the origin.
Part A: What is the potential V(z) due to the ring on the z axis as a function of z? Express your answer in terms of Q, z, R, and k=14.
Part B: What is the magnitude of the electric field E? on the z axis as a function of z, for z>0? Express your answer in terms of some or all of the quantities Q, z, R, and k=14.