1. The problem statement, all variables and given/known data The figure shows three very thin parallel planes of charge with equal separation 8 cm between them. The charge density of the middle plane is +4 nC/m2 (nC = "nano Coulomb") and that of the two outer planes is -2nC/m2. Use Gauss's law to solve the following questions. We choose positive electric field along the y-direction. What is the Electric Field at point C? 2. Relevant equations E=ρD/ε Electric Field at position D 3. The attempt at a solution I've tried to Calculate the E at distance between The top Positive ρ and the point C and from the bottom ρ to point C. Should these two be equal? From top: (4e-9c/m^2 * 0.004m) / ε to give me field to point C From bottom: (2e-9c/m^2 * 0.004m) / ε to give field to point C I know the field results in a - I've tried to add them to get the answer and subtract. What am I to do from this point? Am I using the wrong equation? Thanks!