Physics topic - Electric flux

Electric Flux (ϕ)
The total number of electric field lines passing through "Perpendicularly" the area of a
surface.
Factors Affecting Electric Flux
Some of the factors affecting electric flux are:
 Electric Field Strength (E): Φ ∝ E, thus it increases with the increase in electric
filed lines.
 Area of the Surface (S): Φ ∝ S, thus its magnitude increases with increase of
the area.
 cos θ: Φ ∝ cos θ It attains the maximum value of 1 for θ = 0, and minimum value
as -1 for θ = 180.

Mathematically the electric flux is defined as:
The dot product of electric field intensity (E) and the vector area (∆S) is called electric flux.
  E.dsS
  E S cos

Φ is Electric Flux
ΔS is the magnitude of the area element
 is the angle between E and 𝑛̂ . (area unit vector)

SI Unit of Electric Flux
The unit of electric flux can be derived from putting the units of different values in the
formula for calculating electric flux.
Φ = E × S × cos θ
Therefore,
Unit of (Φ) = Unit of (E) × Unit of (A) × Unit of cos θ
= N/C×𝑚2 ×1
Unit of (Φ) = N/C×𝑚2