# Fringing of electric field

I have read that in a capacitor with charged parallel plates the electric field lines are parallel in the middle, but they tend to bend outwards (causing a "fringe") towards the ends of the parallel plates. Can someone explain why this really happens? Does it happen due to the lack of symmetry, which is usually present in an infinitely long charged plate? It is to some extent obvious that the electric field isn't uniform at the ends, but why should they bend outwards only, can't they bend inwards?

• Think about what the equipotential surfaces should look like. Feb 22 '20 at 6:22
• Can you provide a more foolproof explanation?I dont seem to get you. Feb 22 '20 at 7:41

The potential difference between the plates is $$-\displaystyle \int^{\large +}_{\large -} \vec E \cdot d\vec s$$.