Page 21 - Electrostatics 11

Grade 11 © GC Shiba

Electric flux: Electric flux is the
number of electric lines of force passing

normally through a certain area. It is
2
-1
denoted by . Its SI unit is Nm C .

Electric flux density: Electric flux density is the number of electric lines of force

passing normally through unit area. It is denoted by E.
Electric flux density is measured by the electric intensity since the lines of force
are closer to each other in the high electric intensity region and away from each

other in the low electric field.

Mathematically, =

∴ = .

☻ State and explain Gauss theorem and use it to find the electric

field due to a charged sphere at a point

i. Outside the sphere and

ii. Inside the sphere

Gauss Theorem:

Statement: The total electric flux passing through the closed surface of

1
arbitrary shape is equal to times the enclosed charge where ∈ is the
∈ 0 0
permittivity of a free space.
ℎ
∴ =
∈ 0

21 Electrostatics