Lect07 - Physics 212 Lecture 7, Slide 1 Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 7, Slide 1 Physics 212 Lecture 7 Today's Concept: Conductors and Capacitance Physics 212 Lecture 7 Music Who is the Artist? A) Ricky Skaggs B) Bill Monroe C) Mark O’Connor D) Chris Thile E) Mike Marshall Why? Final Ellnora Tribute: Mandolin virtuoso who played with Michael Daves on guitar Friday afternoon.. Great show !! My Favorite? Hard to say.. There were many, but if I had to pick one, I’ll go with Richard Thompson. Physics 212 Lecture 7, Slide 3 LOGISTICS 1) EXAM 1: WED Sep. 21 at 7pm Sign Up in Gradebook for Conflict Exam at 5:15pm if desired 2) EXAM 1 PREPARATION? Old exams are on-line (“ Practice Exams ”), also “ Worked Examples ” BY THURS. SEP. 15 at 10:00 p.m. MATERIAL: Lectures 1 - 8 Physics 212 Lecture 7, Slide 4 Your Comments 05 We will do all of these in this lecture, including a calculation of a cylindrical capacitor “A little more about the neutral plate in the middle of capacitors.” “It would be nice to discuss examples of capacitors other than the parallel plates in a bit more depth.” “Can we see some capacitor demo's? Possibly very large capacitors being discharged?” “Can we please talk about homework problems a little bit at the end of the lecture? So that we can have an idea about how to start on the homework...” “ I found most of this lecture to be confusing because it's something completely new. Go over it all please! ” “I think this stuff is tough, but I can get a handle on it.” Physics 212 Lecture 7, Slide 5 Conductors • Charges free to move • E = 0 in a conductor • Surface = Equipotential • E at surface perpendicular to surface 5 You did well on the questions on charge distributions on conductors The Main Points Physics 212 Lecture 7, Slide 6 Checkpoint 1a “The surface of conductors are equipotentials so they are equal in potential despite the increased radius.“ “V=kQ/R! Since the Ra is greater than Rb, the Va<Vb” 6 Two spherical conductors are separated by a large distance. They each carry the same positive charge Q. Conductor A has a larger radius than conductor B. Compare the potential at the surface of conductor A with the potential at the surface of conductor B. A. V A > V B B. V A = V B C. V A < V B Physics 212 Lecture 7, Slide 7 Checkpoint 1b “ No matter what the initial conditions are, when both spheres are making contact, their potential has to be equal since they are connected by a wire that makes them behave like a single conductor. ” 7 The two conductors are now connected by a wire. How do the potentials at the conductor surfaces compare now? A. V A > V B B. V A = V B C. V A < V B Physics 212 Lecture 7, Slide 8 Checkpoint 1c “Charge will always move to a place with lower potential, and the larger sphere has a lower potential than the smaller sphere. ” “the charge would decrease in order to compensate for the lower charge on the...
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This note was uploaded on 03/12/2012 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect07 - Physics 212 Lecture 7, Slide 1 Physics 212 Lecture...

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