What are dielectrics? Distinguish polar and nonpolar dielectrics. Define the term polarization vector.

a) Dielectrics are insulating materials; polar dielectrics have permanent dipole moments
b) Dielectrics are conductive materials; nonpolar dielectrics have permanent dipole moments
c) Dielectrics are conductive materials; polar dielectrics have induced dipole moments
d) Dielectrics are insulating materials; nonpolar dielectrics have induced dipole moments