Consider a large conductor, large enough so that you may assume it is an infinite plate. The top of the conductor has a charge amp;#963; C/m^2.

Consider a large conductor, large enough so that you may assume it is an infinite plate. The top of the conductor has a charge σ C/m^2. Draw a Gaussian surface that takes advantage of what you know about the electric field. Use Gauss’s law to determine the electrical field above the conductor.