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A square plate of edge length 13.0 cm and negligible thickness has a total charge of 5.00 10-6 C.

A square plate of edge length 13.0 cm and negligible thickness has a total charge of 5.00 10-6 C. (a) Estimate the magnitude E of the electric field just off the center of the plate (at, say, a distance of 0.50 mm from the center) by assuming that the charge is spread uniformly over the two faces of the plate.
(b) Estimate E at a distance of 40 m (large relative to the plate size) by assuming that the plate is a point charge.

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