Estimating the magnitude of the electric field


A square metal plate of edge length 12.0 cm and negligible thickness has a total charge of 7.50×10-6 C. Estimate the magnitude E of the electric field just off the center of the plate (at, say, a distance of 0.50 mm) by assuming that the charge is spread uniformly over the two faces of the plate. Estimate E at a distance of 38 m (large relative to the plate size) by assuming that the plate is a point charge.

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Physics: Estimating the magnitude of the electric field
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