Please help, thin sheet electric potential problem

[charlies1902]

Homework Statement

Consider 2 infinite parallel thin sheets of charge, one in the x=0 plane and the other in the x=a plane. The potential is 0 at the origin. Find the electric potential everywhere in space if the planes have equal positive charge densities of +omega.


I honestly don't even know where to start for this except that you need to find the potential in 3 regions.

 

[charlies1902]

https://docs.google.com/a/rams.colo...ZZR4YW&sig=AHIEtbTBAiZnseDLRJgLrWuHXMUTVADRew

On page 9 they show you how to do the problem. I don't understand why the limits of integration for x<0 is from 0 to x and why for x>a it's from a to x