Electric flux
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In electromagnetism, electric flux is the flux of the electric field. Electric flux is proportional to the number of electric field lines going through a virtual surface. The electric flux 
through a small area 
is given by
(the electric field, E, multiplied by the component of area perpendicular to the field). The electric flux over a surface S is therefore given by the surface integral:
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 a closed Gaussian surface, electric flux is given by:
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 the four Maxwell's equations.
Electrical flux has SI units of volt metres (V m), or, equivalently, newton metres squared per coulomb (N m2 C−1). The SI base units of the electric field are kg•m3•s-3•A-1.
[edit] See also
Farady has performed the experiment on electric field and he found that the total charge on the outer surface was equal in magnitude to the charge placed on the inner surface.there are some sort of displacement from the inner surface to outer surface which was independent of the dielectric material used between tow sphere .It is referred as electric flux or displacement flux. it is denoted by sye and its dimension is coulombs
