Say you have a set of parallel plates, one is positive and one is negative, if you change the distance between them would electric field strength change or potential difference, given the equation
From pure intuition, I think electric field strength will change as the field line bulges out from the sides, and as the plates are far enough from each other, each plate can be treated as a point charge and the system becomes a dipole, and E decreases at 1/r^3:
picture: (sorry I didn't upload the picture here in case I violate copyright) http://www.electrobasic.com/uploads/3/2/3/4/32342637/9893979_orig.jpg
But I read from this post:Why does the potential difference between two charged plates increase as they move further apart? and it says E must remain constant, and I am not sure why that is, and I do not see how simply moving the plates apart will increase the potential difference, as
and as r increases, v should decrease, and I don't understand how simply moving them apart will store energy in the system.
So why must E remain constant and V increase as the plates are separated further?