Assume a uniformly charged ring of radius R and charge Q produces an electric field Eing at a point P on its axis, at distance x away from the center of the ring as in figure (a). Now imagine the same charge Q is spread uniformly over the circular area the ring encloses, forming a flat disk of charge with the same radius. How does the field Eisk by the disk at P compare with the field produced by the ring at the same point? produced 1. Edisk

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