FREE BEE Bachelor of Electrical Engineering Engineering Electromagnetics Fundamentals Questions and Answers

Question 1

Which of the following is the differential form of Faraday's Law of Induction, a fundamental component of Maxwell's Equations?

Accepted Answer

∇ × E = -∂B/∂t

Answer

∇ ⋅ D = ρv

Answer

∇ ⋅ B = 0

Answer

∇ × H = J + ∂D/∂t

Question 2

A uniform plane wave is propagating in a lossless, source-free medium. Which statement accurately describes the relationship between the electric field (E), the magnetic field (H), and the direction of propagation (k)?

Accepted Answer

E, H, and k are all mutually perpendicular to each other.

Answer

E is parallel to H, and both are perpendicular to k.

Answer

E is perpendicular to H, and both are parallel to k.

Answer

E, H, and k are all mutually parallel to each other.

Question 3

In electromagnetics, what is the primary purpose of the constitutive relations?

Accepted Answer

To relate the fundamental field quantities (E and B) to the auxiliary field quantities (D and H) based on the properties of a material.

Answer

To describe the behavior of charges and currents in a vacuum.

Answer

To provide the boundary conditions at the interface between two different media.

Answer

To define the speed of light as a universal constant.

Question 4

An engineer is designing a microwave circuit on a printed circuit board. A transmission line with a characteristic impedance of 50 Ω is terminated with a load impedance of 100 Ω. What is the value of the voltage reflection coefficient (Γ) at the load?

Accepted Answer

0.333

Answer

-0.5

Answer

0.5

Answer

-1

Question 5

Which of the following boundary conditions must be satisfied for the tangential component of the electric field (Et) at the interface between a dielectric and a perfect electrical conductor (PEC)?

Accepted Answer

Et on the dielectric side must be zero.

Answer

Et is continuous across the boundary.

Answer

Et on the dielectric side is equal to the surface charge density on the conductor.

Answer

Et is infinite at the boundary.

Question 6

The addition of the displacement current term (∂D/∂t) to Ampere's circuital law was Maxwell's key contribution. What physical phenomenon did this term predict?

Accepted Answer

The propagation of electromagnetic waves.

Answer

The existence of magnetic monopoles.

Answer

The quantization of electric charge.

Answer

That only moving charges (conduction current) can create a magnetic field.