p240_ct4_w12_jan_17

P240_ct4_w12_jan_17 - Physics 240 Winter 2012 Lecture#4 My Office Hours(1416 Randall Lab Monday 1pm-3pm Tuesday 1pm-3pm Thursday 2pm-4pm(Prof

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Physics 240 Winter 2012 Lecture #4 Dr. Dave Winn 2405 Randall Lab [email protected] 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!

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E&M Survey Take E&M Survey before Friday January 20 (10pm). You get 2% added to your absolute grade if you take both survey‟s (survey 2 is at the end of the term) This is a really big deal for your grade! Only takes 30 minutes For reference, here is the grade scale for the course, 2% is huge, don‟t miss it! Grading will be on an absolute scale: – 82-100% A – 72-82% B – 54-72% C – 45-54% D ABSOLUTELY NO LATE SURVEYS WILL BE ACCEPTED!!!
A spherical Gaussian surface (#1) encloses and is centered on a point charge + q . A second spherical Gaussian surface (#2) of the same size also encloses the charge but is not centered on it. Compared to the electric flux through surface #1, the flux through surface #2 is A. greater. B. the same. C. less, but not zero. D. zero. E. not enough information given to decide Q22.1 + q Gaussian surface #1 Gaussian surface #2

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Two point charges, + q (in red) and – q (in blue), are arranged as shown. Through which closed surface(s) is the net electric flux equal to zero? Q22.2 A. surface A B. surface B C. surface C D. surface D E. both surface C and surface D
• Point charges interact through Coulomb‟s law • We find the total electric force by taking the vector sum of the Coulomb forces from every point charge • Each charge is surrounded by an „electric field‟ which fills space • We find the total electric field by taking

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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_ct4_w12_jan_17 - Physics 240 Winter 2012 Lecture#4 My Office Hours(1416 Randall Lab Monday 1pm-3pm Tuesday 1pm-3pm Thursday 2pm-4pm(Prof

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