Question

For making a capacitor, the dielectric should have __________

(a) High relative permittivity

(b) Low relative permittivity

(c) Relative permittivity = 1

(d) Relative permittivity neither too high nor too low

I got this question at a job interview.

My question comes from Advanced Problems on Network Theory in section Network Theory and Complex Circuit Diagram of Network Theory

Answer 1

The correct answer is (a) High relative permittivity

The explanation: Relative permittivity is for ideal dielectric which is air. Achieving such a precise dielectric is very difficult.

Low relative permittivity will lead to low value of capacitance.

High relative permittivity will lead to a higher value of capacitance.