Question

A dielectric is always an insulator. But an insulator is not necessarily a dielectric. State True/False.

(a) True

(b) False

The question was posed to me during an online exam.

My question comes from Dielectrics topic in section Electric Fields in Material Space of Electromagnetic Theory

Answer 1

Correct option is (a) True

For explanation I would say: For a material to be dielectric, its permittivity should be very high. This is seen in insulators. For a material to be insulator, the condition is to have large band gap energy. However, this is not necessary for a dielectric.