Free electric charge within the dielectric is

Dipole moment per unit volume is called

Which of the following represents electric polarisation?

Those molecules in which the centre of gravity of positive nuclei and revolving electrons do not coincide are

In polar dielectrics, tiny electric dipoles are randomly oriented

Choose the correct relation between polarisation and electric susceptibility of dielectric material.

The capacitance of a parallel plate capacitor with air as dielectric is $C$. If a slab of dielectric constant $K$ and of the same thickness as the separation between the plates is introduced so as to fill ${\frac{1}{4}}^{\mathrm{th}}$ of the capacitor (shown in figure), then the new capacitance is,