Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
Polarisation vector
Dielectric Materials and Insulation
It is defined as the average dipole moment per unit volume of a dielectric
POLARISATION VECTOR 
It is defined as the average dipole moment per unit volume of a dielectric. If N is the number of atoms per unit volume and 
is average dipole moment per atom, then
Polarisation vector
Its unit is coulomb/m2
Electric displacement vector 
Since the electric field intensity depends on the medium, we define another electric vector which depends only on magnitude of charge and its distribution. It is independent on the nature of medium. This electric vector is known as electric displacement vector.
The electric displacement vector is used for analysing electrostatic fields in the presence of dielectrics.
It is given by 
... (1)
We know that electric field intensity,
From equations (1) and (2), we have
where xe is electrical susceptibility.
Electrical susceptibility (Xe)
It is found that for a large number of dielectrics, the polarisation vector 
is proportional to the applied electrical field 
for field strengths that are not too large.
Thus,
where Xe is a scalar constant. It is known as electrical susceptibility. It is a characteristic property of every dielectric.
Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation : Tag: : Dielectric Materials and Insulation - Polarisation vector
Physics for Electrical Engineering: Unit I: Dielectric Materials and Insulation
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Physics for Electrical Engineering
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