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Electric Flux Density

Electric flux density is defined as the number of tubes of force per unit area emanated normally from the surface. Eclectic flux density s represented by D and is measured in coulmbs/m2.

Let there be a  point charge of Q coulombs placed at the centre of an imaginary sphere of radius r metres. The number of lines of force per unit area of the surface of the sphere,

D =  Q

If the surrounding medium has a relative permittivity εr then the electric field intensity normal to the sphere surface is             where εo is the permittivity of evacuated space or air.
                      4πεoεr r2

Hence     D = εoεr E

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