Dielectric made of polar molecules

Dielectrics such as water, hydrogenchloride and alcohol made of molecules that have non uniform distribution of electric charges. In such materials, molecules in which the positive charge centre will not coincide with the centre of the negative charge, even in the absence of electric field. This shown in the following figure.
In the absence of external electric field, these molecules shows the polar characterstic, therefore when these molecules placed in an external electric field, the field will try to orient the positive charge centres in the direction of the field and negative charge centres in the opposite direction.
When polar molecules placed between the plates of a charged capacitor, the effect will be similar to that of non-polar molecules, the effect will be more pronounced because the molecules are already polarized even without field. The capacitance will increase C=KCo