BEE Electromagnetic Fields and Waves 2

Question 1

Which of the following correctly states Faraday's Law of electromagnetic induction in differential form?

Accepted Answer

∇ × E = -∂B/∂t

Answer

Faraday's Law states that the curl of E equals the negative time rate of change of B.

Question 2

A parallel-plate capacitor with plate area A and separation d is filled with a dielectric of permittivity ε. What is the electric field inside if voltage V is applied?

Accepted Answer

V/d

Answer

The electric field between parallel plates is E = V/d, independent of the dielectric permittivity for a given voltage.

Question 3

What is the skin depth δ for a good conductor with conductivity σ, permeability μ, at frequency f?

Accepted Answer

Both A and B are equivalent

Answer

Both 1/√(πfμσ) and √(2/ωμσ) are equivalent expressions for skin depth since ω = 2πf.

Question 4

The Poynting vector S = E × H represents which physical quantity?

Accepted Answer

Power density flowing through a surface

Answer

The Poynting vector gives the instantaneous power per unit area (W/m²) transported by an EM wave.

Question 5

For a uniform plane wave in free space, the ratio of the magnitudes |E|/|H| equals:

Accepted Answer

Both A and B since 377 ≈ 120π

Answer

The intrinsic impedance of free space η₀ = √(μ₀/ε₀) ≈ 377 Ω = 120π Ω.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE Electromagnetic Fields and Waves 2