Category : JEE Main & Advanced
Electric flux is a measure of 'flow' of electric field through a surface. It is equal to the product of an area element and the perpendicular component of \[\overrightarrow{E}\], integrated over a surface.
(1) Flux of electric field \[\overrightarrow{E}\] through any area \[\overrightarrow{A}\] is defined as.
\[\varphi =E.A\cos \theta \] or \[\varphi =\overrightarrow{E}.\overrightarrow{A}\]
(2) In case of variable electric field or curved area. \[\varphi =\int{\overrightarrow{E}.\,\overrightarrow{dA}}\]
(3) It's S.I. Unit is (Volt \[\times \] m) or \[\frac{N\text{-}{{m}^{2}}}{C}\]
(4) For a closed body outward flux is taken to be positive while inward flux is taken to be negative.
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