Electric Susceptibility

Electric Susceptibility:


Whenever an external electric field is applied across a dielectric, a net dipole moment induced in it. The dipole moment induced depends upon the electric field applied on it.


Hence, the dipole moment induced per unit volume is given by


                 P E


Or             P = χe E   …………….(1)


Where χe is constant of proportionality and is known as electric Susceptibility.


From equation 1, we can write


             χe = P / E


If ,          E = 1

then.      χe = P.


Hence, the electric susceptibility is defined as the dipole moment induced per unit volume in a dielectric material when an unit electric field is applied across it.




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