Andhra University 2007 B.E ELECTRO MAGNETIC FIELD THEORY - exam paper

II Year B.E./B.Tech Degree exams

ELECTRO MAGNETIC FIELD THEORY

Electronics & Communication Engineering

Time : 3 hours Maximum : 75 Marks

ques. one is compulsory

ans any 4 from ques. two to 8

All ques. carry equal marks



1. a) Write Coulomb’s legal regulations in mathematical form

b) describe electric flux density in terms of electric flux and also

electric field

c) State Lorentz force formula

d) Write Maxwell’s equations in free space

e) State the conditions for lossless line and also for distortion

less line

2. a) Derive an expression for electric field due to a surface charge.

b) A sphere of quantity 0.1m3 has a charge density of 8.0

pC/m3. obtain out electric field at a point (2,0,0) if the centre

of the sphere is at (0,0,0).

3. a) provide the boundary conditions and prove the boundary

conditions on E and D.

b) The region y < 0 contains a dielectric material for which

r1 2.0 Î = and the region y > 0 contains a dielectric material

for which r2 4.0 Î = . If E1 = -3.0ax+5.0ay+7.0az V/

m. obtain the electric field, E2 and D2 in medium 2.

4. a) Derive an expression of energy stored in an electrostatic

field.

b) A parallel plate capacitor has conducting plates of area equal

Earning:   Approval pending.