Electric Flux: Definition, Equation & Examples

[ewr]

Why is the electric flux defined as (electric field) x (area), Φ = EA? How do you come up with that equation? Is it because the electric flux is proportional to the charge and surface area?

 

[Nugatory]

That's close, although it's not quite right to say that it's proportional to the charge; you can get the same amount of flux through a given surface with a small charge nearby or a larger charge farther away. That's why the field strength E appears in the formula.

 

[AdityaDev]

Flux Is defined as the number of field Lines passing normally through a given area.
Hence $dR = E.dS = Edscosx$