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Electromagnetic Field And Waves (EMFW) Lecture 1: Introduction and Motivation 17 Feb 2013

Electromagnetic Field And Waves (EMFW) Lecture 1: Introduction and Motivation 17 Feb 2013. By: Chandra Thapa Mail ID1: chandra2thapa@gmail.com Mail ID2: chandrat@nec.edu.np Web: http://nec.edu.np/faculty/chandrat/. Michael Faraday: 1791 - 1867. James Clerk Maxwell: 1831-1879.

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Electromagnetic Field And Waves (EMFW) Lecture 1: Introduction and Motivation 17 Feb 2013

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  1. Electromagnetic Field And Waves (EMFW)Lecture 1: Introduction and Motivation17 Feb 2013 By: Chandra Thapa Mail ID1: chandra2thapa@gmail.com Mail ID2: chandrat@nec.edu.np Web: http://nec.edu.np/faculty/chandrat/

  2. Michael Faraday: 1791 - 1867

  3. James Clerk Maxwell: 1831-1879

  4. André-Marie Ampere:1775-1836

  5. Carl Friedrich Gauss: 1777-1855

  6. Any guess about Electromagnetics?? • Google  ??? • Bing ?? • Yahoo search ?? • संगै बसेको साथी?

  7. I found like this  (बिधार्थी हुदा )

  8. I found like this  (NOW)

  9. Electromagnetics subject??? • Hard to understand? • Hard to learn? • Long syllabus? • Many students failed? • Low score? • What else????????????  गाह्रो त छ |

  10. How does this subject look like?? • Physics? • Mathematics? • Engineering subject?

  11. Syllabus • 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

  12. Boring Part  Question pattern?? • Theory + Problems (Numerical)

  13. Happy Part  Knowledge • It’s really cool  • Wide application

  14. Subject matter flow • 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

  15. Prerequisite • Co-ordinate systems • Cross product, Dot product, Vector, Scalar • Derivative • Integration • Gradient • Divergence • Curl Math is problem solving tool!

  16. References • My Notes • पासा को पसल को फोटो कापी नोट What I prefer?? • 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 • Engineering Electromagnetics by William H. Hayt, JR (available at NEC library Run fast and get one  reserve one copy for you ;) ) • MIT, Standford Universities, IITs online video lectures (YouTube) Any other? स्थानीय लेखक ,भारतीय लेखक का किताबहरु (I don’t prefer)

  17. Some questions? • 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 • 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 • 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

  18. 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

  19. Student Activities • Project Work (I will assign topic, student have to make report and present it in class) • Tutorials • Class Exams

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