Electromagnetic Field And Waves (EMFW)
Lecture 1: Introduction and Motivation17 Feb 2013
By: Chandra Thapa
Mail ID1: [email protected] ID2: [email protected]: 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 ?? संगै बसेको साथी?
I found like this ( बि�धार्थी� 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?
Syllabus1. Coulomb’s Law and Electric field intensity2. Electric Flux Density and Gauss Law3. Divergence4. Energy and Potential 5. Electrostatic Field in material media6. Boundary value problem in electrostatics7. Current and current density8. Magnetostatic9. Curl10. Magnetic Force and Material Media11. Time varying force and material media12. Wave Equation13. Transmission Lines14. Wave Guides
Boring Part
Question pattern??
Theory + Problems (Numerical)
Happy Part
Knowledge
It’s really cool Wide application
Subject matter flow1. Electrostatic (Charges at rest, no magnetic
field)2. Magnetostatic (Magnet at rest, Current
constant, no electric field)3. Electromagnetics Wave (Time varying
case, both electric field and magnetic field are present)
4. Transmission lines
Prerequisite
1. Co-ordinate systems2. Cross product, Dot product, Vector, Scalar3. Derivative4. Integration5. Gradient6. Divergence7. Curl
Math is problem solving tool!
References1. My Notes2. पासा को पसल को फोटो कापी नोट
What I prefer??
3. 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
4. Engineering Electromagnetics by William H. Hayt, JR (available at NEC library Run fast and get one reserve one copy for you ;) )
5. MIT, Standford Universities, IITs online video lectures (YouTube)
Any other?
स्थानीय लेखक , भारतीय लेखक का बिकता�हरु (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
