Which of the following is the dimensional formula for electric polarisation?

The potential gradient at which the dielectric of a condenser just gets punctured is called

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

Define dielectric constant.

$A$ dielectric slab of dielectric constant $K$ is placed between the plates of a parallel plate capacitor carrying charge $q$. The induced charge $q^{\prime}$ on the surface of the slab is given by

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.