ECE-305-Lecture7

ECE-305-Lecture7 - Engineering Electro-Magnetics...

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Engineering Electro-Magnetics Engineering Electro-Magnetics ECE-305, Lecture 7 Dennis McCaughey, Ph.D. 18 February, 2010

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02/18/2010 Dennis McCaughey, ECE305, Spring 2010 2 Homework Homework Problem 4.6 Due Tuesday 2/23 A similar problem will be on the test
02/18/2010 Dennis McCaughey, ECE305, Spring 2010 3 Energy and Potential Energy and Potential We wish to move a charge a distance in an electric field The subscript reminds us the force arises from the field The component of the force in the direction which we must overcome is E EL Q d Q d F = = L E F E L where is a unit vector in the direction of The force that must be applied is equal and opposite to the force associated with the field Expenditure of energy is force times di L L L L appl a Q a a d F Q a = = - F E L E stance L final initial dW Q a dL Q d and W Q d = - = - = - E E L E L

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02/18/2010 Dennis McCaughey, ECE305, Spring 2010 4 Conditions Under Which W is Zero Conditions Under Which W is Zero
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This note was uploaded on 09/13/2011 for the course ECE 305 taught by Professor Staff during the Spring '08 term at George Mason.

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ECE-305-Lecture7 - Engineering Electro-Magnetics...

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