A solid metallic sphere of radius a carries total charge Q. No other charges are nearby. The electric field just outside its surface is keQ/a2 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/ε0 or σ/2ε0?
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ok ... what the electric field from a (infinite) flat sheet with charge density sigma?
its asking which one would i use to solve the problem.
And I'm asking you what you know about the electric field from a flat conducting sheet. This is a standard result. The question is really asking you to remember which formula is for two parallel sheets, and for just one sheet.
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