Lect16 - Physics 212 Lecture 16, Slide Physics 212 Lecture...

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Unformatted text preview: Physics 212 Lecture 16, Slide Physics 212 Lecture 16, Slide 1 Physics 212 Physics 212 Lecture 16 Lecture 16 Motional EMF EMF stands for electromotive force (voltage) Induced Induced emf emf !! !! Conductors moving in B field Conductors moving in B field 10 20 30 40 50 Avg Avg = 2.8 = 2.8 Confused Confused Confident Confident Physics 212 Lecture 16, Slide Physics 212 Lecture 16, Slide 2 Your Comments: What do you want covered e v e r y t h i n g p l e a s e Where do babies come from? Tim used to always put student answers and quotes into his power points. I never made it on last semester and hoped that my dreams might come true this time, but I was saddened when I came to the realization that you very rarely include student comments on the powerpoint. I was just writing to let you know that I am finally accepting my defeat, and thank you for helping make me a stronger person. pretty much everything cause i dont understand a single thing in the lecture. you really have to explain this stuff more clearly cause i am literally learning absolutely nothing. at this rate im am going to fail the midterm and it will be your fault, not mine Sun/Mon office hrs + mine Wed & Thu 3PM Loomis 309 Physics 212 Lecture 16, Slide Physics 212 Lecture 16, Slide 3 The Big Idea When a conductor moves through a region containing a magnetic field: Magnetic forces may be exerted on the charge carriers in the conductor 05 v These forces produce a charge separation in the conductor X X X X X X X X X X X X X X X X X X B X X X X X X X X X X X X X X X X X X +- F F This charge separation or redistribution creates an electric field in the conductor The equilibrium distribution is reached when the forces on charges from the electric and magnetic fields cancel The equilibrium electric field produces a potential difference (emf) in the conductor B v q F r r r = +- +- E +- E + F B F E qE qvB = vB E = EL V = L vBL V = Physics 212 Lecture 16, Slide Physics 212 Lecture 16, Slide 4 Rotate picture by 90 Rotate picture by 90 o v X X X X X X X X X X X X X X X X X X B X X X X X X X X X X X X X X X X X X X v b a 20 40 60 80 :22 BB BB Bar a Bar a No force on charges No charge separation No E field No emf Preflight 2 A B C D +- F a = 0 = 0 +- F F F b = = qvB qvB Bar b Bar b Opposite forces on charges Charge separation E = vB emf = EL = vBL B v q F r r r = Physics 212 Lecture 16, Slide Physics 212 Lecture 16, Slide 5 10 20 30 40 50 60 70 :22 BB BB Rotate picture by 90 Rotate picture by 90 o...
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This note was uploaded on 02/21/2011 for the course PHYS 212 taught by Professor Kim during the Spring '08 term at University of Illinois, Urbana Champaign.

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Lect16 - Physics 212 Lecture 16, Slide Physics 212 Lecture...

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