197030

0 21551 (Pages : 3) पि ग ०००००००० வக
நத... ‏یما‎
‎FOURTH SEMESTER (CBCSS—UG) DEGREE EXAMINATION
APRIL 2022

Physics/Applied Physics
PHY4B04/APH4B04—ELECTRODYNAMICS—II
(2019 Admission onwards)
Time: Two Hours Maximum : 60 Marks
Section A

Answer at least eight questions.
Each question carries 3 marks.
All questions can be attended.
Overall Ceiling 24.
1. Explain Ohm’s law. Discuss the terms involved.
What do you mean by the term displacement current ? Give an expression for the same.

3. Illustrate the symmetry of Maxwell’s equations for E and B in the absence of the charge and
current density terms.

What is Poynting vector ? Give an expression for the same.

Give the wave equation for the magnetic field vector B in free space and explain the terms involved.
Write down the expression for the speed of the wave.

6. What do you mean by a monochromatic plane wave ? Give its general form.
7. Write down the boundary conditions for the magnetic field vector B at an interface separating two
linear media of permittivities ¢; and e. and permeabilities 1, and po.
8. Distinguish between initiation and transition transient currents.
What do you mean by wattles current ?
10. Give Kirchhof’s mesh law.
11. What are the features of an ideal constant voltage source ?
12. What is reciprocity theorem ?
(8 x 3 = 24 marks)

Turn over

197030