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

Equal to the magnetic charge density

Answer

Equal to the current density

Answer

Proportional to the electric field

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

3 × 10⁸ m/s

Answer

6 × 10⁸ m/s

Answer

0.75 × 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

It is zero at the boundary

Answer

It is discontinuous by an amount equal to the surface charge

Answer

It doubles at the boundary

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

Vd

Answer

V/d²

Answer

V²/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 energy stored in the magnetic field

Answer

The rate of charge accumulation on a surface

Answer

The force per unit charge on a test particle

Question 6

A 10 GHz electromagnetic wave travels through free space. What is its wavelength?

Accepted Answer

3 cm

Answer

30 cm

Answer

0.3 cm

Answer

3 m