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Lect16 - Physics 212 Lecture 16 Motional EMF Conductors...

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Physics 212 Lecture 16, Slide 1 Physics 212 Lecture 16 Motional EMF Induced emf !! Conductors moving in B field
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Music Who is the Artist? A) Gram Parsons B) Tom Waits C) Elvis Costello D) Townes Van Zandt E) John Prine Why? Theme of the week? Guys who sing with Emmylou Harris !! I do like these albums.. Giving you a break from Jazz this week…
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Physics 212 Lecture 16, Slide 3 Your Comments 05 “HELP, I really need help with this one.” “i ...... dont understand ..... The most common comments… All comes from - “I'm lost. This just seemed like so much information way too fast I don't feel like i really grasped any of it.” “How do you get current from velocity?” “How are all these induced current directions supposed to be coming from? How do we determine their directions?” “My brain hurts”
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Physics 212 Lecture 16, Slide 4 B v q F × =
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Physics 212 Lecture 16, Slide 5 Your Comments 05 “The rotating loop in the generator portion of the prelecture and checkpoint was difficult to understand. Step-by-step today “I was really confused by the generator segment. Could you please explain this in more detail?” “HELP, I really need help with this one.” “i ...... dont understand ..... The most common comments… All comes from - “I'm lost. This just seemed like so much information way too fast I don't feel like i really grasped any of it.” “How do you get current from velocity?” “How are all these induced current directions supposed to be coming from? How do we determine their directions?” “My brain hurts” “These current loops have me all eMOTIONAL about physics.” “IF you don't post this I WILL CRY DURING LECTURE!” “I can't believe I made the board last lecture!!!!! And I didn't even have to do a terrible pun to get on. I didn't know how to react! Who knew it would be so e-MOTIONAL? ”
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Physics 212 Lecture 16, Slide 6 The Big Idea When a conductor moves through a region containg a magnetic field: square4 Magnetic forces may be exerted on the charge carriers in the conductor 05 v square4 These forces produce a charge separation in the conductor X X X X X X X X X B X X X X X X X X X + - F F square4 This charge distribution creates an electric field in the conductor square4 The equilibrium distribution is reached when the forces from the electric and magnetic fields cancel square4 The equilibrium electric field produces a potential difference (emf) in the conductor B v q F arrowrightnosp arrowrightnosp arrowrightnosp × = + - + - E + - E + F B F E qE qvB = vB E = Δ V = EL L Δ V = vBL
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Physics 212 Lecture 16, Slide 7 Rotate picture by 90 o (top view) v X X X X X X X X X B X X X X X X X X X X v b a :22 Bar a No force on charges No charge separation No E field No emf Checkpoint 1 A B C D + - v || B F a = 0 + - F F F b = qvB Bar b Opposite forces on charges Charge separation E = vB emf = EL = vBL Two identical conducting bars (shown in end view) are moving through a vertical magnetic field. Bar (a) is moving vertically and bar (b) is moving horizontally.
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