Download Register No. SNS COLLEGE OF ENGINEERING Kurumbapalayam

Register No.
SNS COLLEGE OF ENGINEERING
Kurumbapalayam(Po), Coimbatore – 641 107
Accredited by NAAC-UGC with ‘A’ Grade
Approved by AICTE & Affiliated to Anna University, Chennai
INTERNAL ASSESMENT EXAMINATIONS - III
COURSE: B.E – ECE
EC 6403 – ELECTROMAGNETIC FIELDS
Date: 17th April 2017
Maximum: 100 Marks
Class: IV Sem ECE
Duration: 3 Hours
Answer ALL questions
PART A - (10 X 2 = 20 marks)
1.
2.
3.
4.
5.
What is Magnetostatics?
Distinguish between self inductance and mutual inductance.
Give any two dissimilarities between electric and magnetic circuits.
A conductor of 1 m length is moved with a velocity of 100 m/sec, perpendicular to a
field of 1 Tesla. What is the value of emf induced.
Differentiate diamagnetic, paramagnetic and ferromagnetic material.
State Faraday’s law of induction.
Mention the properties of uniform plane wave.
Can a magnetic field exist in a good conductor if it is static or time varying. Justify it.
Recall Slepian vector
A plane travelling wave in free space has an average Poynting vector of 1.5 watts/m2.
10.
Calculate the average energy density.
6.
7.
8.
9.
CO-4
CO-4
CO-4
CO-4
K1
K2
K2
K3
2
CO-4
K2
2
2
2
2
CO-5
CO-5
CO-5
CO-5
CO-5
K1
K1
K4
K1
K3
CO-4
K2
2
2
2
2
2
PART B - ( 5X 16 = 80 marks)
11.
(a)
(b)
12.
(a)
(i)
(i)
(i)
(ii)
Obtain an expression for force on an individual current element and between
two current conductors.
OR
In region 1, μr1 = 10 and in region 2, μr2 = 2. Also, B1 = 10 ax +20 ay +30 az
mT, everywhere in region 1. Find (i) the angle θ1 that B1 makes with the
normal to the boundary and (ii) the the angle θ2 that B2 makes with the normal
to the boundary
Evaluate the inductance of solenoid of 2500 turns wound uniformly over a
length of 0.5 m on a cylindrical paper tube 5 cm in diameter.
The core of a toroid is 12 cm2 and is made of material with μr = 200. If the
mean radius of the toroid is 50 cm, calculate the number of turns needed to
obtain aan inductance of 2.5 H
1
13
13
7
K
3
CO-4
CO-4
K3
C0-4
6
K3
(b)
13.
(a)
(b)
14.
(i)
(i)
Derive the expressions for energy stored and energy density in the magnetic
field
OR
Describe the fundamental relations between electrostatics and magnetostatic
field
8
5
13
13
CO-4
CO-4
K2
K2
C0-4
K2
CO-5
K2
CO-5
K2
C0-5
K2
Deduce the Maxwell’s Equation in integral and differential forms
OR
Explain about stationary loop in time varying magnetic field and moving loop
in static magnetic field
13
Derive the wave equation for uniform plane waves
OR
Calculate the intrinsic impedance, the propagation constant, and the wave
velocity for a conducting medium in which σ = 58 MS/m, μr = 1, at a
frequency f = 100 MHz
13
CO-5
K2
13
C0-5
K3
Summarize the construction and working principle of Electrostatic Deflection in Cathode
Ray tube
16
CO-4
(a)
(b)
15.
(i)
(ii)
OR
Discuss potential energy and force on magnetic materials.
Tabulate the similarities and dissimilarities between self inductance and mutual
inductance.
(i)
(i)
(a)
(i)
(b)
(i)
13
PART C - ( 1X 16 = 16 marks)
16.
2
K2