E-field at various points from two "large" sheets 1.You've hung two very large sheets of plastic facing each other with distance d between them, as shown in the figure . By rubbing them with wool and silk, you've managed to give one sheet a uniform surface charge density n1 = -n_o and the other a uniform surface charge density n2 = 3n_o . 2. electric field equations 3. Ok, I know that since both sheets are "large" that their field strength is uniform and independent of distance. Thus, point 1, for example, I would just add the -n_0 and 3n_o since the field vectors for the left plate point to the right for point one and the vectors from the far plate point left... but how do I do this in terms of n_o / epsilon_o? I tried entering a numerical value based on the simple addition I described but its wrong.