Question

Let
A = (x1, y1) B = (x2, y2) + sigma E E = sigma/2epsilon0 VAB = VA - VB E x1 y1 x2 y2
and ${\rm B} = \left( x_2,y_2 \right)$ be two points near and on the same side of acharged sheet with surface charge density $+ \sigma$ . The electric field $E_vec$ due to such a charged sheet has magnitude $E = \frac {\sigma}{2 \epsilon_0}$ everywhere, and the field points away from thesheet, as shown in the diagram.  

What is the potential difference $V_{\rm AB} = V_{\rm A} - V_{\rm B}$ between points A and B?

Express your answer in terms of someor all of , $x_1$ , $y_1$ , $x_2$ , and $y_2$ .