Question

In the absence of an external field the dipole moments of polar molecules of a dielectric​

Answer 1

Answer:

In the absence of any external field, dipole moment of each non-polar molecule is zero. In the presence of an external field, the centres of positive charges are displaced in the direction of external field while the centres of negative charges are displaced in the opposite direction.

Answer 2

Answer:

In the absence of an external electric field, the tiny molecular electric dipoles are randomly arranged due to thermal agitation. Thus the net electric dipole moment of the polar dielectric is zero. ... Thus there is a net dipole moment in the direction of the field.