I'm working on an electrostatics problem and I'd like to find out what the divergence is in a weird coordinate system.
The problem is a cone with a fixed charge.
In the attached image, you can see that $x$ is the distance along the cone and $y$ is the distance normal to the cone.
Everything is axisymmetric about the red line.
My question is, what is the divergence in terms of $x$ and $y$ and PHI ($\phi$)? Thanks.
