114. (a) The charge on every part of the ring is the same distance from any point Pon the axis. This distance is rzR=+22, where Ris the radius of the ring and zis the distance from the center of the ring to P. The electric potential at Pis VdqrdqzRdqq==+=+=+zzz1414141140000ππππεεε.(b) The electric field is along the axis and its component is given by
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