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**~Electrodynamics~ Potential from charged sphere. I am lost :/**

## Homework Statement

A sphere of radius R, centered at the origin, carries a charge density ρ(r,θ)=κ/r^2(R-2r)sin^2(θ).

κ is constant. Find exact potential.

## Homework Equations

1/4∏ε∫ρ∂t/r

## The Attempt at a Solution

Question and attempt via attachments :)

I do not think my solution is correct please help!

Thanks all for looking!