Solve for the Electric force exerted on a Particle a distance z above a uniform ring of charge Q.
Determine the potential energy of the charge where the charge lies directly in the center.
The Attempt at a Solution
Knowing E=F/q I just solved for E then multiplied it by the charge q.
resulting in E=kQz/(z^2+a^2)^3/2 thus, F=kqQz/(z^2+a^2)^3/2
Now, I'm not sure about how to go about expressing the potential energy.
My intuition tells me to do Work=Potential Energy, so,
W= integral of[F(dot)dl]
I'm not sure where to go from here because I'm not sure as to what I should make dl.