I'm trying to understand electrical potential and have a couple thought questions (Part A and part B) Part A Is it possible to calculate the potential of point between to infinite plates having the same positive charge? I know the electric field is zero between the plates but it would be constant out side the plates. So i'm assuming the potential out side of an infinite plate would be infinite. So would that mean that any point in between the two plates would also be infinite? I suppose if this is true that in real life plates are not infinite and the farther you get from the plates they would look more like a point charge. Part B If I have 4 charges: -2C, 4C, -3C, 1C spaced "L" from a center point and if I'm wondering what the potential of a point a distance of R from the center point if R>>L . If R is much greater than L then I'm thinking I could just add the charges together and then V would be V = kQ/R where Q = 0 for this case so the Potential would be 0. Is this correct?