1. There's a picture of Electric Field lines going down. Now between these electric field lines (affected by them) are points A and B at differing heights and positions. My question is, how does potential change as you go up/down and left/right? I would like to think that going down means you're going with the electric field so ΔV = +Ed which would be higher than going up and against the electric field ΔV = -Ed But how about moving left to right and vice versa in a electric field moving down? I'd think they're equal to 0 because they don't move along the E or against it and therefore their distance is neither + or -. 2. Another question about potential: If you drop a proton between 2 sheets, one being +80V and the other being -80V, what would happen to the proton? I'd say it stays in the middle because the same, but opposing, electric fields would be affecting it.