M.Sc. DEGREE EXAMINATION, APRIL 2016
Second Semester
Physics
ELECTROMAGNETIC THEORY
(CBCS 2011 onwards)
Time 3 Hours Maximum 75 Marks
Section A (10 2 20)
Answer all the questions.
All questions carry equal marks.
1. Under what condition will the force on a current carrying
wire placed in a magnetic induction be zero?
2. Can there be vector potential with zero magnetic field?
3. Define Snell's law.
4. What is Brewster angle?
5. What is the difference between dispersion and scattering?
6. Define polarization.
7. Distinguish between TE and TM modes.
8. Define the characteristic impedance and the propagation
constant.
9. What is plasma?
10. What is pinch effect?
Sub. Code
521203
RW-10846
2
Wk 16
Section B 5 25)
Answer all the questions choosing either or
11. Derive the wave equation in terms of scalar
potential.
Or
Find the electric field intensity and the electric
potential due to a dipole.
12. Write the boundary conditions for electrodynamics
in the case of linear media.
Or
Explain polarization and propagation vectors.
13. Distinguish the normal and anomalous dispersions.
Or
Derive Lorentz-Lorentz formula.
14. Explain the resonant cavities in TM mode.
Or
Discuss the working principle of a klystron.
15. Explain the motion of a charged particle in a
uniform magnetic field.
Or
Discuss the general properties of plasma.
RW-10846
3
Wk 16
Section C 10 30)
Answer any three questions.
All questions carry equal marks.
16. State and prove first and second uniqueness theorem.
17. Derive the reflection and transmission coefficients at
normal incidence on the boundary between two linear
media.
18. Derive Maxwell's equation in matter and also write down
the constitutive relations among fields.
19. Explain the construction and working of a Gunn diode.
20. Derive the wave equations for E and B field in vacuum.
Discuss its energy and momentum.