>>16710085 (OP)Anon, this is basic Electrostatics. I did this in the first year of university. At the beginning of the first year of university. This was like the beginning of the course, not even the later part of the course. Easily.
It's not even modern, at best it's last refinements came from Maxwell in the 1850s?
Do you understand what a volume is? Do you understand what a surface is? Can you imagine that charge is distributed?