Hall Ticket No Question Paper Code: AEE006
INSTITUTE OF AERONAUTICAL ENGINEERING
(Autonomous)
B.Tech III Semester End Examinations (Regular) December, 2017
Regulation: IARE R16
ELECTROMAGNETIC FIELD THEORY
(Electrical and Electronics Engineering)
Time: 3 Hours Max Marks: 70
Answer ONE Question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
UNIT I
1. Determine electric field intensity at any point due to an infinite sheet of charge having uniform
surface charge density. Verify the result using Gauss's law.
Obtain the relation between electric field strength and potential. The potential is given as
V 80x0:6 V. Assuming free space conditions, find:
E
ii) Find E if the volume charge density at 0.5 C/m3
2. State Coulomb's law. Point charges of 50nC each are located at
and in free space. Find the total force on the charge at A.
Two point charges located and 5 are located at and respectively.Find
the potential at assuming zero potential at infinity.
UNIT II
3. Find the capacitance of the coaxial cable of inner radius and outer radius
A parallel plate capacitor has a separation of 1cm. A thin piece of glass with "r 6.5 and
thickness 0.2cm is inserted between the plates. The dielectric strength of air is 30 kV/cm and
that of glass is 290 kV/cm. If 29 kV is applied across the capacitor find whether glass or air will
breakdown.
4. Show that the capacitance of the concentric spheres is 4
Q
"
1
a

b
where V 0 at r V V0
at r b a.
Explain
dipole moment and polarization
ii) point form of Ohm's law
ii) current and current density
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UNIT III
5. State Biot-Savart's Law. Given points and a current element
IdL − 3ay az]Am at C produces a field dH at P. Find dH.
Assume that there is a region with cylindrical symmetry in which the conductivity is given by
kS/m. An electric field of 30 az V/m is present.
Find J
ii) Find the total current crossing the surface z all
iii) Make use of Ampere's circuital law to find
6. Within the conductor, H 1052a' A/m. Find the value of current density.
A filamentary conductor on the z axis carries a current of 16A in the az direction, a conducting
shell at 6 carries a total current of 12 A in the −az direction, and another shell at 10
carries a total current of 4A in the −az direction. Find H for 0 12.
UNIT IV
7. Explain the concept of scalar and vector magnetic potential with necessary expressions.
A Rectangular loop of wire in free space joins points to to to
to A. The wire carries a current of 6 mA, flowing in the az direction from B to C. A
filamentary current of 15 A flows along the entire z axis in the az direction. Find F on side BC
8. A solenoid of 200 turns wound tightly on a cylindrical tube of length 60cm and of diameter 6cm,
given that medium is air. Find the inductance. Derive the formula used.
Find the force between two parallel current carrying conductors having current in opposite
directions.
UNIT V
9. What is displacement current? Derive the expression for displacement current density from point
form of Amperes' circuital law.
Write short notes on
FDM
ii) FEM
10. Derive Maxwell's equation from Faraday's law. Also write Maxwell's equations for a general
medium for time varying fields.
Explain statically and dynamically induced emf with necessary equations.