Area vector: In many cases, it is convenient to treat area of a field as a vector. The length of the vector shows the magnitude of the area and its direction is along the outward drawn normal to the area.

Electric flux: The electric flux related with any surface in an electric field in basically a measure of total number of lines of forces passing normally through the surface.

Or

Electric flux through an elementary area ds is defined as the scalar product of area of field i.e. 

Hence flux from complete area (S) 

If , i.e. surface area is perpendicular to the electric field, so flux related with it will be max.

Types: For a closed body outward flux is taken to be positive, while inward flux is to negative

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