DISTANCE EDUCATION
M.Sc. (Physics) DEGREE EXAMINATION, MAY 2017.
ELECTROMAGNETIC THEORY
(2008 onwards)
Time Three hours Maximum 100 marks
Answer any FIVE questions.
Each question carries 20 marks.
20 100)
1. Derive poynting theorem for the conservation of
energy in an electro magnetic field and interpret its
various terms.
Explain the polarization of electromagnetic waves.

2. Obtain expression for electromagnetic wave
propagation in a non-conducting medium.
Write down Maxwell's equations in differential form
and point out the physical significance of each
equation.
Explain poynting vector.
3. Explain the total internal reflection at an interface
between two dielectrics.
Define Snell's Law.
Derive Fresnel' s equations for reflection and
refraction of electromagnetic waves at a plane
boundary separating two dielectric media.
Sub. Code
14
DE-652
2
sp4
4. Arrive Brewster's law on the basis of
electromagnetic theory and explain how it can be
verified experimentally.
Determine the reflection and transmission
coefficient if the incident wave is polarized with its
electric power.
5. Listout the characteristics of normal dispersion.
Derive Lorentz dispersion equation.
Prove that in the case of gases the maximum and
minimum values of refractive index occur at the
positions where the absorption co-efficient reaches
half its maximum value.
6. Write short notes on coherence and incoherence of
scattered light.
Briefly explain
Polarization on scattered light and
Scattering and scattering parameters.
7. Write a note on Klystron.
Discuss about Gunn diode.
With a neat diagram explain the working of a
magnetron.
8. State any two application of plasma.
Give the conditions for plasma existence and
occurrence.
Write a note on magneto hydrodynamics.