1. The problem statement, all variables and given/known data Two large, flat metal plates are held parallel to each other and separated by a distance d.· They are connected together at their edge by a metal strip. A thirt plastic sheet carrying a surface charge [tex]\sigma[/tex] per unit area is placed between the plates at a distance 1/3*d from the upper plate. Call E1 and E2 the electric field near the upper and lower plates, respectively. What are E1 and E2? 2. Relevant equations 3. The attempt at a solution Im trying to find a good starting point for solving this problem. First of all,I suppose that the electric field is constant and perpendicular to the plates in every point. But i dont know why. Can you help me ?