electric field at a point near an infinite thin sheet of charged conductor is
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Electric field at a point near an infinite thin sheet of charged conductor is σ/2ε₀
In order to find the electric field at a point P1 on an infinite thin plane charge sheet of positive charge another point P2 is taken on the other side of the sheet, so that P1 and P2 are equidistant from the sheet. Then a cylindrical Gaussian surface is constructed through the plane which extends equally on two sides of the plane. It is seen that the electric field is uniform and does not depend on the distance from the charge sheet.
In order to find the electric field at a point P which is near but outside the conductor. The Gaussian surface is constructed and it is seen that the electric field near a plane charged conductor is twice the electric field. This is in accordance with Coulomb's theorem which states that the electric field at any point very close to the surface of a charged conductor is equal to charge density of the surface divided by free space permittivity.