BEE BEE Bachelor of Electrical Engineering Electromagnetic Fields and Waves Questions and Answers 2

Question 1

What is the divergence of the magnetic flux density B in free space according to Maxwell's equations?

Accepted Answer

Always zero

Answer

Gauss's law for magnetism states that the divergence of B is always zero, confirming that magnetic monopoles do not exist.

Question 2

A uniform plane wave propagates in the +z direction in a lossless medium with relative permittivity 4 and relative permeability 1. What is the phase velocity of the wave?

Accepted Answer

1.5 × 10⁸ m/s

Answer

Phase velocity is c/√(εᵣμᵣ) = 3×10⁸/√4 = 1.5 × 10⁸ m/s.

Question 3

Which boundary condition holds for the tangential component of the electric field at an interface between two perfect dielectrics?

Accepted Answer

It is continuous across the boundary

Answer

The tangential component of E is always continuous across the interface between two dielectrics with no surface charges.

Question 4

In a parallel plate capacitor with plate separation d and voltage V, what is the magnitude of the uniform electric field between the plates?

Accepted Answer

V/d

Answer

For a parallel plate capacitor, the uniform electric field magnitude is simply E = V/d.

Question 5

What does the Poynting vector represent in electromagnetic theory?

Accepted Answer

The direction and magnitude of power flow per unit area

Answer

The Poynting vector S = E × H gives the instantaneous power flow per unit area in the direction of wave propagation.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE BEE Bachelor of Electrical Engineering Electromagnetic Fields and Waves Questions and Answers 2