1. The problem statement, all variables and given/known data two infinitely large plates are at a distance d from each other .they carry a unifor surface charge of densities X and -X.the plates have round coaxial holes of radius R.with d<<R.find the electric field through the axis of the holes(taking them as circles) as a function of distance l from them. 2. Relevant equations 3. The attempt at a solution i think i should find the field due to both the plates and subtaract the field due to the hole.i dont exactly know how to do that if that's how it done.