Two square plates, each with a side length of 5.22 cm, have equal and opposite charges of magnitude 6.152 /C. The plates are separated by 0.0220 cm. (a) Calculate the surface charge density of the positive plate. (b) Calculate the electric field halfway between the two plates. Assume that the separation distance is small in comparison to the side length of the plates. (c) How would the electric field magnitude change if the plates were three times as far apart? How do you know