Yeah I know It is E= kQ/r^2 ...i just want to understand the effect of external charges on a gaussian surface...like in my book they said that external charges don't affect the gaussian surface because all the external field lines come in and come out...no idea what that means tbh
1. We have two positive point charges (+q) at a distance from each other
2. Goal is to Find electric field at point A halfway between the point charges
3.By logic and summation of fields we should get ZERO
4. But how would I use a gaussian surface (sphere i assume ) to prove at point A...