Potential Difference Across a Capacitor

The figure below shows two capacitors. The capacitor on the left has a uniform electric field, ##\vec{E}_1## = < 535, 0 > N/C. The capacitor on the right has a uniform electric field, ##\vec{E}_2## = < -225, 0 > N/C. If we define the point directly between A and B to be the origin, then point A is at < -0.4 , 0 > and point B is at < 0.4, 0 >. Find the potential drop on the path from A to B. If a proton traveled from rest at point A to point B, what would be its kinetic energy at point B?