With the rise in temperature,the dielectric constant $K$ of a liquid

If the relative permittivity for any substance is $80$,then its electric susceptibility is . . . . . . .

Assertion : In the absence of an external electric field,the dipole moment per unit volume of a polar dielectric is zero.
Reason : The dipoles of a polar dielectric are randomly oriented.

Explain the difference in the behaviour of a conductor and a dielectric in the presence of an external electric field.

What is a linear isotropic dielectric?

The dielectric constant of a metal is ........ .