How Is Electric Potential Calculated Above a Charged Ring?

[jlanghart]

Homework Statement

What is the electric potential a distance x above the center of a ring of charge Q with a radius R? Derive the electric field from this relationship.

Homework Equations

ΔVab=-∫E·ds

The Attempt at a Solution

 

[ideasrule]

Every particle on the ring is equally distant from the point where the potential is being calculated. How would you calculate the speed due to one particle at a certain distance?