Question

Which of the following factors are relevant for change in dielectric strength?

(a) Decreases with a decrease in thickness

(b) Decreases with a decrease in temperature

(c) Decreases with an increase in humidity

(d) Decreases with a decrease in frequency

I had been asked this question during an internship interview.

The above asked question is from Polarisation and Dielectrics topic in portion Refractories & Dielectric Materials of Engineering Material & Metallurgy

Answer 1

The correct choice is (c) Decreases with an increase in humidity

Explanation: Dielectric strength is defined as the minimum applied voltage that would result in a fracture. The dielectric strength decreases with increase in thickness of the sample, operating temperature, and the frequency. Increased humidity decreases the dielectric strength in case of gases and air.