This is defined as the flux passing at right angles through
unit area of surface. It is represented by symbol D and measured in coulomb per square meter.

If a flux of Ψ coulombs passes normally (at right angles)
through an area of Am

^{2}, then
Let a point charge of Q coulombs placed at the centre of an
imaginary sphere of radius ‘r’ meters.

Total flux, Ψ = Q

This flux falls normally on a surface area of 4 πr

^{2}(meter)^{2}of sphere. So, electric flux density,
The flux density is also called displacement density.

__1.1 surface Charge Density__

If the charge is distributed over the surface, then the
surface charge density is defined as the charge per unit area of the surface
over which the charge is distributed.it is denoted as δ.

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