5. Electromagnetics and Photonics

Em Fundamentals — Quiz

Test your understanding of em fundamentals with 5 practice questions.

Practice Questions

Question 1

At the surface of a perfect electric conductor, which component of the electric field must be zero?

Question 2

In a linear, isotropic medium with relative permittivity $\varepsilon_{r}=4$ and relative permeability $\mu_{r}=1$, a plane wave has an electric field amplitude of $E_{0}=50\,\mathrm V/m$. What is the magnitude of the magnetic field amplitude $H_{0}$?

Question 3

Which physical principle is implied by the Maxwell equation $\nabla\cdot B=0$ in free space?

Question 4

In electrostatic conditions where fields are time‐invariant, which vector identity of the electric field holds?

Question 5

What is the electric energy density $u_{e}$ in free space for a uniform electric field of magnitude $E_{0}=200\,\mathrm V/m$?