ELECTRIC POLARIZATION OF DIELECTRIC

ELECTRIC POLARIZATION OF DIELECTRIC:-

Under the action of an external applied electric field each dipole of dielectric readjust its position in such a way that its positive pole appears close to negative charged plate and negative pole appears closer to
positively charged plate such phenomenon is called electric polarization.
Electric polarization of dielectric increases the capacitance. Reason is given below:

REASON:-

The molecules of the dielectric material are readily polarised by the electric field between the capacitor plates. Polarised molecules have a distorted charge distribution that gives opposite 'ends' of the molecules an opposite charge .. these charge distributions are aligned by the capacitor field and create their own induced electric field.
This induced field is opposite in direction to the original field. As a consequence the net field strength between the plates is reduced as a result V also decrease by the relation (V=ED) hence the capacitance has been increased by the relation (C = Q/V)