PTU B.Tech 3D EEE 4th Semester May 2019 57106 ELECTROMAGNETIC FIELDS Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 4th Semester Electrical and Electronics Engineering (EEE)-EE-Electrical Engineering

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EE)/(Electrical & Electronics)/
(Electronics & Electrical) (2011 Onwards)
(Sem.?4)
ELECTROMAGNETIC FIELDS
Subject Code : BTEE-403
M.Code : 57106
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
has to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
has to attempt any T WO questions.

SECTION-A
1.
Write briefly :

a) Define current density at a given point.

b) Write the expression for energy stored in magnetic field.

c) Define Electric Dipole.

d) State the condition for the vector F to be solenoidal.

e) Write down the magnetic boundary conditions.

f) What is Lorentz force?

g) Mention the properties of uniform plane wave.

h) What is the effect of permittivity on the force between two charges?

i) State Maxwell's third equation.

j) State Gauss law for magnetic field.
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SECTION-B
2.
Derive the expression for force on a moving charge in a magnetic field.
3.
Derive Poisson's equation.
4.
Explain the importance of cylindrical and spherical coordinate systems with suitable
example for study of electromagnetics.
5.
What is meant by skin depth of conductor? How it is related to attenuation constant?
How does it depend upon conductivity and frequency?
6.
A 300Hz uniform plane wave propagates through fresh water for which = 0, r = l,
r = 7.8.

Calculate :

a) Attenuation constant.

b) The phase constant.

SECTION-C
7.
Using Maxwell equations, derive the Poynting's theorem.
8.
a) Derive the equation of continuity for time varying fields.

b) State and explain the electrostatic boundary conditions existing at the boundary

between two dielectrics.
9.
Write short notes on the following :

a) Uniqueness Theorem

b) Reflection by perfect insulator at oblique incidence.



NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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