Maxwell's Equations/Gauss's Law

Physical Law

 * $\nabla \cdot \mathbf E = \dfrac \rho {\varepsilon_0}$

where:
 * $\nabla \cdot \mathbf E$ denotes the divergence of the electric field $\mathbf E$
 * $\rho$ denotes volume charge density
 * $\varepsilon_0$ denotes the permittivity of free space.