Answer by Massimo Ortolano for Electric field near surface of conductor...
Start considering a small charged planar disc of surface $\Delta S$, which remains the same if you mirror it. The magnitude of the field is then the same below and above the disc by symmetry. See also...
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Electric field near surface of conductor derivation
In page-50 of I.E irodov Basic Laws of Electromagnetism, he derives the relation for the force on surface of a conductor by every other charge distributed across the rest of the surface area.The proof...
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