A square insulating sheet whose sides have length L is held horizontally. The sheet has a charge of Q spread uniformly over its area.
a) Estimate the electric field at a point located a distance r_2 above the center of the sheet. Use the appropriate approximations based on the fact that r_2 >> L.
E * dA = Q_encl/epsilon_0
The Attempt at a Solution
The area of the square sheet is L^2, which can go into the equation above. From that, I know that the electric field for r_2 << L is E = Q /(2*epsilon_0*L^2), but I can't seem to figure out the field for r_2 >> L.