B B5802 Pages: 2

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018
Course Code: EC303

Course Name: APPLIED ELECTROMAGNETIC THEORY (EC)

Max. Marks: 100 Duration: 3 Hours
PART A
Answer any two full questions, each carries 15 marks Marks
1 2) State and prove Ampere’s law. (6) b) Find the expression for magnetic field intensity at

the center of a circular wire (9) carrying current I in the anticlockwise direction. The radius of
the circle is ‘a’ and the wire is in XY plane.

Y

2 ಖ Define electric field intensity. Derive the equation for electric field intensity at a (7) distance
‘r’ from a point charge of © coulombs.
0) Acharge of -0.3uC is located at A (25,-30,15) in cm and a second charge of 0.5 (8) uC
at B (-10, 8, 12). Find E at:
i) Origin ii) P (15,20,50) in cm.
3 ஐ Define curl of a vector field. (2) b) Derive the equation for curl of a vector field in
Cartesian co-ordinate system. (8)
c) A vector field is given by the following equation A ‏لا‎ (ycosax a) ‏لاء‎ Oy e* )a,. (5) Find
the curl of Aat the origin.

PART B
Answer any two full questions, each carries 15 marks

4 a) Write the general wave equation for a conductive medium and explain each term. (4) b)
Define skin depth for a conductive medium? If o denote the conductivity, Derive (5) the equation
for skin depth for a good conductor.

0) Find the skin depth, 6 at a frequency of 1.6 MHz in aluminium, where (6) o=38.2MS/m andU,
O1. Also find the propagation constant, y and the wave velocityv.
5 a) Derive the equation for Electric and Magnetic field intensities for an (9)

electromagnetic wave propagating in the z-direction in a dielectric medium with parametersHO,, ,

. Find thefollowing:
i) Attenuation constant ii) Phase velocity iii)
Phase constant iv) Intrinsic impedance

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