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Answer to Question #43095 in Electromagnetism for sara

Question #43095
A solid metallic sphere of radius a carries total charge Q. No other charges are nearby. The electric field just outside its surface is kQ/a^2 radially outward. At this close point the uniformly charged surface of the sphere looks exactly like a uniform flat sheet of charge.Is the electric field here given by σ/ε or σ/2ε?

how come it is not σ/2ε since it is a sheet of charge?
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