Question

The effective skin resistance of a material with conductivity 120 and skin depth of 2μm is

(a) 4.16 kilo ohm

(b) 4.16 mega ohm

(c) 41.6 kilo ohm

(d) 41.6 mega ohm

This question was posed to me in an online interview.

I want to ask this question from Skin Effect topic in section Transmission Lines of Electromagnetic Theory

Answer 1

Correct answer is (a) 4.16 kilo ohm

The best explanation: The effective skin resistance is given by Rs = 1/δσ, where δ is the skin depth and σ is the conductivity. For the given data, δ = 2 x 10^-6 and σ = 120, we get Rs = 1/(120x2x10^-6) = 4.16 kilo ohm.