The dielectric constant for a metal is

Explain the polarization of a polar molecule in a uniform electric field.

What are polar and non-polar molecules?

The dielectric constant $K$ of an insulator cannot be

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Net dipole moment of a polar dielectric substance is zero in the absence of an external electric field.
Reason $(R)$: In the absence of an external electric field,the different permanent dipoles of a polar dielectric substance are oriented in random directions.
In the light of the above statements,choose the most appropriate answer from the options given below.

How does the polarised dielectric modify the original external field inside it?