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The electric flux density (D) and the electric field intensity (E) are related by the equation:
[ mathbf{D} = varepsilon mathbf{E} ]
In this equation, ( mathbf{D} ) represents the electric flux density, ( mathbf{E} ) represents the electric field intensity, and ( varepsilon ) is the permittivity of the medium in which the electric field exists. The permittivity ( varepsilon ) is a measure of how much the electric field is diminished inside the medium. It is product of the permittivity of free space ( varepsilon_0 ) (a constant) and the relative permittivity ( varepsilon_r ) (also called the dielectric constant) of the medium: ( varepsilon = varepsilon_0 varepsilon_r ).
a
Explanation: The electric flux density is directly proportional to electric field intensity. The
proportionality constant is permittivity. D=ε E. It is clear that both are in linear
relationship.