Transcript Electromagnetic Field And Waves (EMFW)

Electromagnetic Field And Waves
(EMFW)
Lecture 1: Introduction and Motivation
17 Feb 2013
By: Chandra Thapa
Mail ID1: [email protected]
Mail ID2: [email protected]
Web: http://nec.edu.np/faculty/chandrat/
Michael Faraday: 1791 - 1867
James Clerk Maxwell: 1831-1879
André-Marie Ampere:1775-1836
Carl Friedrich Gauss: 1777-1855
Any guess about Electromagnetics??
Google  ???
 Bing  ??
 Yahoo search  ??
 सग
ं ै बसेको साथी?

I found like this 
(बिधार्थी हुदा )
I found like this 
(NOW)
Electromagnetics subject???
Hard to understand?
 Hard to learn?
 Long syllabus?
 Many students failed?
 Low score?
 What else????????????

 गाह्रो त छ |

How does this subject look like??
Physics?
 Mathematics?
 Engineering subject?

Syllabus
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Coulomb’s Law and Electric field intensity
Electric Flux Density and Gauss Law
Divergence
Energy and Potential
Electrostatic Field in material media
Boundary value problem in electrostatics
Current and current density
Magnetostatic
Curl
Magnetic Force and Material Media
Time varying force and material media
Wave Equation
Transmission Lines
Wave Guides
Boring Part 
Question pattern??
 Theory +
Problems (Numerical)
Happy Part 
Knowledge
really cool 
 Wide application
 It’s
Subject matter flow
1.
2.
3.
4.
Electrostatic (Charges at rest, no magnetic
field)
Magnetostatic (Magnet at rest, Current
constant, no electric field)
Electromagnetics Wave (Time varying
case, both electric field and magnetic field
are present)
Transmission lines
Prerequisite
1.
2.
3.
4.
5.
6.
7.
Co-ordinate systems
Cross product, Dot product, Vector, Scalar
Derivative
Integration
Gradient
Divergence
Curl
Math is problem solving tool!
References
1.
2.
My Notes
पासा को पसल को फोटो कापी नोट
What I prefer??
1.
Principles of Electromagnetics (Fourth Edition) by Matthew N.O. Sadiku
 Bad news   Not available at NEC Library
 Happy news   I can give you soft copy
2.
Engineering Electromagnetics by William H. Hayt, JR (available at NEC
library Run fast and get one  reserve one copy for you ;) )
3.
MIT, Standford Universities, IITs online video lectures (YouTube)
Any other?
स्र्थानीय लेखक , भारतीय लेखक का बकतािहरु (I don’t prefer)
Some questions?
1.
How does the region above the volcano become electrified and is there any
way to tell whether the sparks travel up from the crater or down to it?
Clue: Electric field
2.
How wide is a lightning strike? Since a strike can be seen from kilometers
away, is it as wide as, say, a car?
Clue: Gauss’ Law
3.
During ventricular fibrillation, a common type of heart attack, the chambers
of the heart fail to pump blood because their muscle fibers randomly contract
and relax. To save a victim of ventricular fibrillation, the heart muscle must
be shocked to reestablish its normal rhythm. For that, 20A of current must be
sent through the chest cavity to transfer 200 J of electrical energy in about
2ms. This requires about 100kW of electric power. Such a requirement may
easily be met in a hospital, but not by say the electrical system of an
ambulance arriving to help the victim. What, then, can power needed for
defibrillation at remote4 locations.
Clue: Capacitance
Applications
 Antenna (Design)
 Motors
 Magnetic Resonance
Imaging (MRI)
 Generators
 Study of EM waves
 High speed trains
(Maglev-magnetic
levitation)
JR-Maglev at Yamanashi, Japan test track in November 2005
Student Activities
 Project Work (I will assign topic, student
have to make report and present it in class)
 Tutorials
 Class Exams