B.E. / B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009.
Fourth Semester
Electronics and Communication Engineering
(Common to B.E. (Part-Time) Third Semester Regulation 2005)
Time : Three hours : Maximum ; 100 marks
Answer ALL questions.
PART A
1. Define Stoke’s Theorem.
2. State Coloumb’s Law.
3. State Biot-Savart's law.
4. State Ampere’s circuital law.
5. State the Laplace’s equations in Cartesian, cylindrical and spherical coordinates.
6. what are the basic properties of conductors?
7. Write down Maxwell’s equations for free space in point form.
8. Define displacement current density.
9. What is Brewster angle?
10. What are the classifications in polarizations?
PART B—(5 x 16=80 marks)
11. (a) (i) Find the Electric due to n - charges. (8)
(ii) Establish the relation between potential and electric field. (8)
Of
(b) Find the Electric Field to infinite long straight line.
12. (a) Find the magnetic flux density at a point on the axis of a circular loop of a radius b that carries current I
Or
(b) A circular loop located on x2 + y2 = 9, z =_0 carries a direct current of
10 A along a . Determine H at (0,0,4) and (0,0,-4).
13. (a) Find the expression for the cylindrical capacitance using Laplace’s
equation.
Or
(b) Derive an expression for potential energy stored in the system of n point
charges.
14. (a) Derive Maxwell’s four equations in point form and in differential form.
Or
(b) Explain instantaneous, average and complex Poynting vector.
15. (a) Obtain the Wave equation for a conducting medium.
Or
(b) Obtain the expression for the Reflection by a perfect dielectric — Normal
Incidence.
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