Electric flux is defined as the number of electric lines of force (or electric field lines) passing through a surface.
The figure shows uniform electric field lines passing through a rectangular surface S of area A. If the angle between electric field vector (vector E) and area vector (vector A) the direction of which is perpendicular to the given surface) is Theta then the electric flux passing through this surface is:
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The electric flux is a scalar quantity and its unit is Nm2/C.
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