Circular ring and potential at its centre.

[lavanyasharma]

Homework Statement

Consider a circular ring of radius r, uniformly hcarged with linear density lambda. Find the electric potential at a point on the axis at a distance x from the centre of the ring. Using this expression for the potential, find the electric field at this point.

Homework Equations

V = Kq/r
Electric field = spatial derivative of voltage

The Attempt at a Solution

I'm having trouble finding the potential! I do not understand how to calculate the potential due to a ring? I can't assume it to be a point hcarge!

 

[ehild]

I'm having trouble finding the potential! I do not understand how to calculate the potential due to a ring? I can't assume it to be a point hcarge!

The charge carried on a small length dl can be considered as point charge. Calculate the contribution of the charge dq=Lambda*dl to the potential at x and integrate round the ring.

ehild