# Electrostatics - Charge Density

by Herbststurm
Tags: charge, density, electrostatics
 P: 24 Hi, if we only have an electrostatic potential given. How to calculate the charge density? I know of course Maxwell equation, here without any time dependence, but I missed always some further specifications, or I forget something important thanks greetings
 Sci Advisor P: 1,548 Use Laplace's equation (derived from Gauss's Law): $$-\nabla^2 \Phi = \rho / \epsilon_0$$
 Sci Advisor P: 1,241 That's Poisson, not Laplace.
P: 24

## Electrostatics - Charge Density

Thanks, that helps a lot.

I knew Poissons equation, but I forgot it. Damn...

Greetings

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