1. The problem statement, all variables and given/known data This is from the book Engineering Electromagnetics by Hayt & Buck. 2. Relevant equations E = - (ΔV/ΔL) 3. The attempt at a solution At part (a), I took the potential difference between point A and the point directly above at the higher surface (106 V) and plugged in the needed values: E = - (106-104 V)/(2-Ay mm) = - 1000 V/m which is ≠ -1075-Ay V/m. Were there things that I have overlooked?