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0 41238 (Pages : 3) வாரி? அவைத்‌ வைக

FOURTH SEMESTER (CBCSS—UG) DEGREE EXAMINATION
APRIL 2023
Physics/Applied Physics
PHY 4B 04/APH 4B 04—ELECTRODYNAMICS—II
(2019 Admission onwards)

Time: Two Hours Maximum : 60 Marks
The symbols used in question paper have their usual meanings
Section A (Short Answer Type)
Answer all questions in two or three sentences, each correct answer carries a maximum of 2 marks.

1. Explain the Neumann formula in mutual inductance.

2. Write down the equation of continuity in electrodynamics. Explain the terms involved.
3. Show that the Maxwell’s equations for E and B are symmetric in free space.
4

Explain the term polarization in the context of electromagnetic waves. Draw a suitable figure to

indicate the polarization vector.

5. Write down wave equation for the electric field vector E in free space and explain the terms involved.

What is the expression for the speed of the wave ?

6. Write down the boundary conditions for the electric field vector E at an interface separating two

linear media of permittivities உட வும்‌ ‏وع‎ and permeabilities 1, and pp.
7. What are gauge transformations ?
8. Discuss the two different types of transient currents in circuits.
9. Give anexpression for the DC transient current in an R-C series circuit. Explain the terms involved.

10. What are the differences between a ballistic galvanometer and an ordinary moving-coil

galvanometer ?
11. What is Kirchhoff’s current law ?
12. What is maximum power transfer theorem ?

(Ceiling - 20)

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