Question

What is the induced dipole moment developed per unit volume of a dielectric when placed in an external electric field called?

(a) Relative permittivity

(b) Polarisation susceptibility

(c) Electric susceptibility

(d) Polarisation density

This question was addressed to me by my school principal while I was bunking the class.

Origin of the question is Dielectrics and Polarisation in division Electrostatic Potential and Capacitance of Physics – Class 12

Answer 1

Right answer is (d) Polarisation density

To elaborate: The induced dipole moment developed per unit volume of a dielectric when placed in an external electric field is called polarization density. It may be defined as the charge induced per unit surface area.