Electrostatic potential of circular ring:)

I’m a little stumped with this problem, I have posted a photograph below as there is a diagram to compliment the question

Attachment 68394

Expressions which I used where

V(r)= k q/r

Where q= σ da

Where da is an element of area

And k= 1/4πε

I messed around with these expressions for a while but it didn’t really go anywhere I was having trouble defining and element of area (to use spherical coordinates or not).

Any help or suggestions would be great thanks in advanced :):):):)


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