p240_ct7_w12_jan_26 - Physics 240 Winter 2012 Lecture #7...

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Unformatted text preview: Physics 240 Winter 2012 Lecture #7 Dr. Dave Winn 2405 Randall Lab winn@umich.edu My Office Hours (1416 Randall Lab) Monday 1pm-3pm Tuesday 1pm-3pm Thursday 2pm-4pm (Prof. Gidley) Learning Assistant Office Hours Tuesday 4-8pm Thursday 4-6pm Also in chat room Tue/Thu evening! Where an electric field line crosses an equipotential surface, the angle between the field line and the equipotential is Q23.10 A. zero. B. between zero and 90. C. 90. D. not enough information given to decide The direction of the electric potential gradient at a certain point Q23.11 A. is the same as the direction of the electric field at that point. B. is opposite to the direction of the electric field at that point. C. is perpendicular to the direction of the electric field at that point. D. not enough information given to decide Visualizing Field and Potential Field lines show direction of force on a positive charge Density of field lines show strength of field, point downhill on potential Equipotentials show curves of constant potential. They are perpendicular to field lines Spacing of equipotentials shows strength of field: close lines => steep slope => strong field What is potential from a system? To find the potential due to a system of charges, just add the potentials from each charge in the system This is ~easy because potential is a scalar quantity! V center = V i = kQ/r + kQ/r kQ/r = kQ/r + + - r r r Q Q -Q No vector addition is needed! Potential due to several charges This is the real virtue of potential. You just have to do an algebraic sum....
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This note was uploaded on 02/15/2012 for the course PHYS 240 taught by Professor Winn during the Winter '11 term at University of Michigan.

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p240_ct7_w12_jan_26 - Physics 240 Winter 2012 Lecture #7...

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