Electric Flux Formula

Electric Flux Formula

The Electric Flux Formula is calculated by multiplying the electric field by the area component perpendicular to the field. It should be mentioned that electric flux is defined as the number of electric field lines travelling through a given region in a given amount of time. Electric flux is measured in volt metres (V m) or newton metres squared per coulomb (N m2 C-1).

The Electric Flux Formula  =E A Cos

Electric Flux

Electric flux is a characteristic of an electric field and is defined as the number of electric lines of force (or electric field lines) that cross a particular region. Electric field lines are thought to start with positive charges and end with negative charges. Field lines pointing towards a closed surface are regarded as negative, whereas those pointing away from a closed surface are considered positive. If a closed surface has no net charge, every field line sent into it continues into the interior and is directed outward somewhere on the surface. The negative flux just matches the positive flux in magnitude, therefore the net or total electric flux is zero. If a net charge is confined within a closed surface, the total flux through the surface is proportional to the enclosed charge, positive if positive, negative if negative.

The Formula for Electric Flux

The electric flux is the total number of electric field lines moving across a specific region in a unit period.


In the same way that the plane is normal to the flow of the electric field in the preceding example, the total flux is given as:

The Electric Flux Formula  =E A Cos

Solved Examples

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