### 131302(EE1201) Electromagnetic Theory Nov/Dec 2007 Question paper Third Semester EEE

B.E/B.TECH DEGREE EXAMINATION,NOV/DEC 2007

third semester
Electromagnetic Theory(EMT)
Regulations 2004

Electrical and Electronics Engg

(Common toB.E (Part -time) Second Semester- Regulations 2005)

Time:Three hours

Maximum:100 marks

PART A -(2X10=20 marks)

1. Define divergence and its phyiscal meaning.

2. State the vector form of electric flux density.

3. State the electric field intensity due to infinite line

charge

4. State the expressions for polarisation.

5. List the applications of Ampere's circuital law.

6. State the expression for H due to infinite sheet of

current.

7 .What is the significance of displacement current density?

8. Write Maxwell's equations in point and integral form for good conductors.

9. Represent the equation of electromagnetic wave in the phasor form.

10. State poynting theorem.

PATR B ( 16X5=80 MARKS)

11. (a) Determine the divergence of these vector fields:

(i) P=x^2yz ax+xz az,

(ii) Q=? sin?a?+?2za?+z cos?az

(iii) T =(1/r2)cos?ar+r sin? cos?a?+cos ? a?

Or

(b) (i) Discuss about curl of a vector

(ii) Derive expression for curl of a vector.

(iii) State stoke’s theorem.

12 (a) The charge is distributed along the z axis from z=-5 m to -infinity and z=+5 m to z=+infinity with a charge density of 20 nC/m. Find E at(2,0,0)m, Also express the answer in cylindrical coordinates.

Or

(b) A parallel place capacitor with a separation of 1 cm has 29kV applied, when air was the dielectric used. Assume that the dielectric strength of air as 30kV/cm. A thin piece of glass with ?r = 6.5 with a dielectric strength of 290 kV/cm with thickness 0.2 cm is inserted .Find whether glass will break or air?

13 (a) Find the magnetic flux intensity at the centre of a square of sides equal to 5m and carrying 10 amperes of current.

Or

(b) Using the concept of magnetic vector potential, derive Biot Savart’s law and Ampere’s law.

14 (a) Derive general field relations for time varying electric and magnetic fields using Maxwell’s equations.

Or

(b) On the basis of analysis of the transmission line,compare circuit theory and field theory.

15 (a) Derive wave equations in phasor form.

Or

(b) Derive suitable relations for integral and point forms of Poynting theorem .

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