p240_ct11_f07 - Physics 240 Fall 2003 Lecture #11 Dr. Dave...

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Physics 240 Fall 2003 Lecture #11 Dr. Dave Winn 2405 Randall winn@umich.edu
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Exam results First exam median ~55% Distribution of scores to the right Remember the overall grading scheme includes all exams, discussions, homework and lecture Comparison Fall 03 median 12 Fall 05 median 13 (with one bad Q credited) Fall 2007 Just one exam, can’t make predictions yet!
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Physics 240 Office Hours Name Office Hours Email Address Winn, Dave Tue & Thu 1:30-3:30Tue 1:30-3:30 winn@umich.edu Bobkov, Konstantin Tue & Thu 10:00-12:00 bobkov@umich.edu Campbell, Myron Thu 12:00-2:00 myron@umich.edu Eckhause, Toby Fri 10-12 & 1-3 eckhause@umich.edu All Office Hours in Physics Help Room (1416 Randall Lab). The help room is open from 9-6pm on all weekdays except Wednesday, when it closes at 4pm.
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Other Resources Study Groups at SLC (might be full) I will post additional recommended book problems to ctools. Try to explain physics concepts to others (friends, parents, your dog, harvey)
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Moving beyond electrostatics… How to make charge move? Start with a conductor (through which charge can flow) Apply an electric field If the conductor is isolated , charge moves to cancel the field After this charge stops moving ------------------- +++++++++++
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Moving beyond electrostatics… How to make charge move? Start with a conductor (through which charge can flow) Apply an electric field If the conductor is connected in a circuit , charge moves but never manages to cancel the field; it continues in a steady flow, a “current” - -
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The water analogy… A conductor is like a tank of water Tilting it is like applying an electric field If it is tilted, and connected to a source of water and a sink, a fluid current will flow
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Moving beyond electrostatics… Electric field through this region requires a change in potential across the conductor Δ V = Ed To keep a current flowing, I have to maintain this potential difference across the conductor d V high V low
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The water analogy… Maintaining the potential difference across
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This note was uploaded on 04/04/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Fall '08 term at University of Michigan.

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p240_ct11_f07 - Physics 240 Fall 2003 Lecture #11 Dr. Dave...

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