# Electric flux

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Electric flux

In electromagnetism, electric flux is flux of the electric field. Electric flux is proportional to the electric field lines going through a virtual surface. Electric flux over surface "S" is therefore given by::$Phi_E = int_S mathbf\left\{E\right\} cdot dmathbf\left\{A\right\}$where E is the electric field and dA is a differential area on the closed surface $S$ with an outward facing surface normal defining its direction.

For closed Gaussian surface, electric flux is given by::$Phi_E = oint_S mathbf\left\{E\right\} cdot dmathbf\left\{A\right\} = frac\left\{Q_S\right\}\left\{epsilon_0\right\}$where QS is the charge enclosed by the surface (including both free and bound charge), and ε0 is the electric constant. This relation is known as Gauss' law for electric field in its integral form and it is one of four Maxwell's equations.

ee also

*Magnetic flux

* [http://hyperphysics.phy-astr.gsu.edu/Hbase/electric/gaulaw.html#c3 Electric flux] — HyperPhysics

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