lec7 - ECE 2112 Electromagnetic Theory Lecture Notes for...

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Lecture Notes for C-term 2009 Lecture 7 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA ECE 2112 Electromagnetic Theory Copyright, 2000 © R. Ludwig
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ECE2112_7 2 Lecture 7 Objectives • What are the basic equations governing electrostatics? • What are the three concepts of electrostatics? • What is linear superposition?
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ECE2112_7 3 ECE 2112 - Lecture 7 • Electrostatics (ES) ES is described by two Maxwell equations ES rests on three principles: existence of charges Coulombs law Linear superposition V D 0 E 2 3 ˆ 4 | | 4 R q q R R R E 
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ECE2112_7 4 ECE 2112 Lecture 7 • Linear superposition (due to A. Sommerfeld) For an assembly of charges, each point charge is added as if it contributes its own field. The respective E-field is the vectorial sum. ] | | ) ( | | ) ( [ 4 1 ) ( 3 2 2 2 3 1 1 1 2 1 R R R R R R R R E E R E Q Q T  N i i i i Q 1 3 | | ) ( 4 1 ) ( R R R R R E Generalized:
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lec7 - ECE 2112 Electromagnetic Theory Lecture Notes for...

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