A square metal plate of edge length 7.0 cm and negligible thickness has a total charge of 8.00×10-6 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) by assuming that the charge is spread uniformly over the two faces of the plate.  b)Estimate E at a distance of 52 m (large relative to the plate size) by assuming that the plate is a point charge.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.