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A disk of radius a has a total charge Q uniformly distributed over its surface.

A disk of radius a has a total charge Q uniformly distributed over its surface. The disk has negligible thickness and lies in the xy plane. If the electric potential is
V(z) =2kQ/a^2(√(a^2+z^2))-z what is the ELECTRIC FIELD?

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Answer #1


Consider a circular disk of radius a that is uniformly charged Q. We are interested to find the potential at a distance z from the center of the disk that is in xy plane. For convienence let us consider a disk of radius R, whose charge is dq. The distance from the edge of the disk to the point on the z axis is √[R^2+z^2].



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