Hi all. I'm having a very hard time understanding this portion of Physics so please bear with me.

The furthest I got with this problem is deciding to use the sum of the potentials at each point to calculate the potential of the system. Something like...

So I suppose [itex]V(x) = kq(\frac{2}{\sqrt{x^{2}+a^{2}}} + \frac{1}{a-x})[/itex] if [itex]x < a[/itex] and [itex]V(x) = kq(\frac{2}{\sqrt{x^{2}+a^{2}}} + \frac{1}{x-a})[/itex] if [itex]x > a[/itex].

I think I can compute [itex]E_{x}(x)[/itex] from here.. Thanks for all your help!