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## Homework Statement

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.

## Homework Equations

F=kq1q1/r^2

## 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.