Electric Potential: Find Potential Everywhere from Two Point Charges

[Crazy Gnome]

Homework Statement

Two point charges q and -q are located on the z axis at (x,y,z) = (0,0,a) and (0,0,-a) respectively.

Find the potential $$\phi$$ everwhere

The Attempt at a Solution

I know all the equations and such, I just don't know how to integrate it. I am guessing that it is in cylindrical coordinates.

 

[Defennder]

Why do you need to integrate it? Just find the potential at any point due to q and the one due to -q and add up the two. This one you can easily apply the formula for potential due to point charge.