Phys 0175 - Lecture 7

Phys 0175 - Lecture 7 - Reminder: Homework Assignments:...

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Reminder: Homework Assignments: PHYS 0175 – LON-CAPA HW #02 Due on Sunday(@10pm), January 25 th .
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Lecture 7 (Jan. 21, 2009): Introduction Definition of the flux of an electric field The concept of a Gaussian surface Statement of Gauss’ Law Equivalence of Gauss’ Law and Coulomb’s Law Some illustrative examples Faraday’s ice pail experiment Chapter 23: Gauss’ Law
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Gauss’ Law (or how to simplify electric field calculations): The approach invented by Carl Friedrich Gauss (1777 – 1855) is this: Take any general distribution of charge Surround it with an imaginary surface that completely encloses the charges Then Gauss’ Law relates the electric field on this imaginary surface to the total (net) charge enclosed. The trick is to select a surface that will give you the electric field where you want to find it.
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Imagine you have a box that may or may not contain electric charge(s). You are asked to find out how much (if any) charge is inside without opening it. How would you go about this problem?
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E on the surface of the box. Remember: E is a vector! Electric field
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Phys 0175 - Lecture 7 - Reminder: Homework Assignments:...

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