DISTANCE EDUCATION
M.Sc. (Physics) DEGREE EXAMINATION, MAY 2016.
ELECTROMAGNETIC THEORY
(2008 onwards)
Time Three hours Maximum 100 marks
Answer any FIVE questions.
Each question carries 20 marks.
× 20 100)
1. Derive the differential form of Maxwell's equation.

Explain the propagation of electromagnetic waves
in free space. Show that the energy flux is velocity
of light times the energy density.
2. Obtain the boundary conditions at the surface of
two dielectric media.
Discuss the Brewster's law and degree of
polarization.
Elaborate the total internal reflection. Prove that
the net energy flow through the surface into second
medium is zero.
3. Distinguish Normal and Anomalous dispersion.
Describe the dispersion in gases. Obtain the Lorentz
dispersion equation.
Obtain Sellmeir's formula from Lorentz formula.
Sub. Code
14
DE-3834
2
wk14
4. What is the principle of waveguides?
Explain the cylindrical waveguide with heat
diagram.
What are TE, TM and TEM modes?
5. What do you mean by plasma?
Give the conditions to exist the plasma.
Explain the charged particle in electric and
magnetic fields.
6. Deduce the Fresnel's phase velocity in the
anisotropic dielectric medium.
Explain the reflection and refraction of e.m waves at
the interface of dielectric media when E is
perpendicular to the plane of incidence.
Give the kinematic properties of electromagneic
waves.
7. Describe Thomson scattering theory.
Why sky appears blue in colour?
Write a note on Gunn diode.
8. Write a short note on
Resonant cavities
Magneto hydrodynamics
Plasma waves.