Question

Calculate the skin depth of a conductor, having a conductivity of 200 units. The wave frequency is 10 GHz in air.

(a) 355.8

(b) 3.558

(c) 35.58

(d) 0.3558

The question was asked in an online interview.

My enquiry is from Skin Effect topic in section Transmission Lines of Electromagnetic Theory

Answer 1

Right answer is (a) 355.8

The explanation: The skin depth is calculated by δ = 1/√(πfμσ), where f is the frequency, μ is the permeability and σ is the conductivity. For the given data, f = 10 x 10^9, μ = 4π x 10^-7 in air and σ = 200, we get δ = 355.8 μm.