(Figure 1) shows two very large slabs of metal that are parallel and distance l apart. The top and bottom surface of each slab has surface area A. The thickness of each slab is so small in comparison to its lateral dimensions that the surface area around the sides is negligible. Metal 1 has total charge Q1=Q and metal 2 has total charge Q2=2Q. Assume Q is positive.
Determine the electric field strength E1 in region 1. Give your answer as a multiple of Q/ε0.
Express your answer in terms of some or all of the variables l, A, Q, and the constant π.