Question

write gauss law for electrostatic.

Answer 1

Gauss law states:

The flux of the electric field $\mathbf{E}$ through any arbitrarily chosen closed surface $S$ is proportional to the electric charge contained within this surface $Q$ .

In formulas:

$$\oint_S\mathbf{E}d\mathbf{S} = \dfrac{Q}{\varepsilon_0}$$

Here $\varepsilon_0$ is the electric constant.