Electromagnetic compatibility, EMC 2019: Assignment 2: Questions with answers

1.0) A 10 MHz wave is travelling in iron with a conductivity is 0.58x107 S/m and relative permeability 500. The skin depth δ is ….. x 10−610−6 m

Answer: 2.82

2.0) A 10 MHz wave is traveling in iron with a conductivity σ=0.58x107and relative permeability 500. The phase velocity v is ….. m/s.

Answer: 185.6953

3.0)

A 10 MHz wave is travelling in iron with a conductivity σ=0.58x107 S/m and relative permeability 500. The wavelength λ is ….. x 10−5 m.

Answer: 1.8569

8.0)

Identify all the true statements from among the following regarding wavelength of electromagnetic signal in a metal, with other parameters kept constant except the one changed

i) Wavelength increases when frequency is decreased

ii) Wavelength increases when magnetic permeability is increased

iii) Wavelength increases when conductivity is decreased

iv) Wavelength is unaffected by changes in magnetic permeability

Statements i), iii) and iv) are true

Statements i), ii) and iii) are true

Only statements i) and iii) are true

Only statements i) and iv) are true