Materials and Components - Engineering

Q1:

When subjected to alternating stresses, an insulating material is characterised by complex dielectric constant ∈'r - j"r . In such materials, the dielectric losses under alternating stress is proportional

A"r

B both ∈'r and ∈"r

C'r

D (∈"r)2

ANS:A - ∈"r

The imaginary part of ∈r gives rise to absorption of energy.