Q.Calculate the electric field intensity at a point just near the surface of a charged plane sheet, measured from its mid-point. [σ = 8.85 μC/m²]

An infinite, uniformly charged flat sheet, with surface charge density σ, produces a field $E=\dfrac{\sigma}{2\epsilon_0}$, directed perpendicular to the sheet and pointing away from it (for positive σ). The most striking feature of this result is that it does NOT depend at all on the distance from the sheet -- the field is exactly the same strength immediately next to the sheet as it is arbitrarily far away, a direct consequence of the sheet's infinite extent. …