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A ring with radius R and a uniformlydistributed total charge Q lies inthe xy plane, centered at the origin.
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 epsilon_0 or k = frac{1}{4 pi epsilon_0}.
What is the magnitude of the electric field E_vec on the z axis as a function of z, for z > 0?
Express your answer in terms of Q, z, R, and epsilon_0 or k = frac{1}{4 pi epsilon_0}.
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