Lecture_10 - Lecture 10-1 Lecture PHYS219 Question 1...

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Lecture 10 Lecture 10 -1 PHYS219 – Question 1 – February 16, 2011 To you, the Exam I was a. Much more difficult than expected b. More difficult than expected c. About as expected d. Easier than expected e. Much easier than expected
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Lecture 10 Lecture 10 -2 PHYS219 – Question 2 – February 16, 2011 On the Exam I, you think you did a. Very well b. Well c. Average d. Poorly e. Very poorly
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Lecture 10 Lecture 10 -3 Motional EMF Motional EMF occurs whenever a conductor moves, cutting through magnetic fields. whether a circuit is completed or not! ( ) B av F ev B = −× JJ GG J G Accumulates conduction electrons near bottom, or E down develops, opposing the accumulation per electron on average Equilibrium is reached when E B Fe E F = −− = JG Ev B =− × G VE L v B L Δ == Potential difference between the ends of rod More generally, ( ) || || L v B L Δ= = × GJ G induced emf L
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Lecture 10 Lecture 10 -4 Motional EMF of Sliding Conductor ¾ Magnitude of induced current I vBl I R R ε == ¾ Direction of current is as if the induced emf were due to a battery. Induced EMF counter-clockwise here vBL ε= Rod slides as before, but there is a complete circuit instead of a rod. • Induced emf moves electrons (current flows).
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This note was uploaded on 04/23/2011 for the course PHYS 219 taught by Professor Staff during the Spring '08 term at Purdue University.

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Lecture_10 - Lecture 10-1 Lecture PHYS219 Question 1...

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