That result is for an infinite sheet of charge, which is a pretty good approximation in certain circumstances--such as if you are close enough to the surface.Of course real sheets of charge are finite and their electric field will diminish with distance if you move far enough away. Example 2- Electric field of an infinite conducting sheet charge. Let’s now try to determine the electric field of a very wide, charged conducting sheet. Let’s say with charge density σ coulombs per meter squared. In this case, we’re dealing with a conducting sheet and let’s try to again draw its thickness in an exaggerated form.