Phys 0175 - Lecture 3

Phys 0175 - Lecture 3 - Lecture 3 (Jan. 9, 2008): Chapter...

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Lecture 3 (Jan. 9, 2008): Conductors and insulators Superconductors and semiconductors Induced charges Shell theorems, along with an illustrative example Chapter 21 (continued):
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Illustrative Example #3.1: What is the net electric force on the charge at the origin? x y -3C @ (0,a) +1C +2C @ (a,0) -1C @ (a,-a) a = 0.35 m 2-D problem
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Conductors and insulators: Conductors permit electric charge to move easily. (For example: copper, silver, gold; in fact, most metals) Insulators do not permit electric charge to move easily. (For example: plastic, wood, glass; in fact, most non-metals.) In terms of the electron configuration, how do conductors and insulators differ?
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Superconductors and semiconductors: Superconductors offer no resistance at all to the movement of electric charge. (Special alloys at very low temperatures.) Semiconductors allow electric charge to flow under certain conditions, sometimes in one direction but not in the opposite direction. (Insulators that are “doped” with different atoms; very important in modern electronics.)
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Charging a metal sphere by induction: This would not work if the sphere were not a conductor!
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This note was uploaded on 04/06/2009 for the course PHYS 0175 taught by Professor Koehler during the Spring '08 term at Pittsburgh.

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Phys 0175 - Lecture 3 - Lecture 3 (Jan. 9, 2008): Chapter...

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