Potential difference due to two uniform sheet charges

[dewel12]

Homework Statement

a) Derive the expression for the potential difference due to two uniform infinite
sheet charges at y=5 and y=-5 in free space.

b) If V=4V at (0,2,10) find V at (-4,3,1) . The surface charge density on the two
sheet charges are ?s=?0 col/m2
[/B]

Homework Equations

The Attempt at a Solution

 

[rude man]

3. The attempt at a solution

Well?