FREE BEE Bachelor of Electrical Engineering Electromagnetic Field Theory Questions and Answers

Question 1

Which of the following Maxwell's equations describes the relationship between a time-varying magnetic field and an electric field?

Accepted Answer

Faraday's Law of Induction

Answer

Gauss's Law for Electric Fields

Answer

Ampere's Law with Maxwell's Correction

Answer

Gauss's Law for Magnetic Fields

Question 2

A uniform plane wave is propagating in a lossless dielectric medium. If the electric field component is given by E(z,t) = 10 cos(ωt - βz) ax V/m, what is the direction of propagation of this wave?

Accepted Answer

Positive z-direction

Answer

Negative z-direction

Answer

Positive x-direction

Answer

Negative x-direction

Question 3

Which of the following conditions must be met for a material to be considered a perfect dielectric?

Accepted Answer

Zero conductivity (σ = 0)

Answer

Infinite permeability (μ = ∞)

Answer

Zero permittivity (ε = 0)

Answer

Infinite conductivity (σ = ∞)

Question 4

In a region where there are no charges or currents, which of the following statements is true regarding the divergence of the magnetic field (∇ ⋅ B)?

Accepted Answer

∇ ⋅ B = 0

Answer

∇ ⋅ B = ρ/ε₀

Answer

∇ ⋅ B = J

Answer

∇ ⋅ B = -∂D/∂t

Question 5

What is the primary effect of increasing the frequency of an electromagnetic wave propagating through a given medium, assuming the medium's properties remain constant?

Accepted Answer

The wavelength decreases.

Answer

The wave velocity increases.

Answer

The characteristic impedance increases.

Answer

The attenuation constant decreases.

Question 6

A capacitor is connected to an AC voltage source. Which of the following statements correctly describes the phase relationship between the current through the capacitor and the voltage across it?

Accepted Answer

The current leads the voltage by 90 degrees.

Answer

The voltage leads the current by 90 degrees.

Answer

The current and voltage are in phase.

Answer

The current lags the voltage by 45 degrees.