Lecture17_Kim

Lecture17_Kim - Lecture 17-1 Physics 241 Question 1 The...

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Lecture 17-1 Physics 241 – Question 1 – October 25, 2011 The same circular loop of wire is near a straight line current I and their centers are in the plane of this sheet in each of the 4 cases shown. When I is increasing, which loop is subject to a repulsive magnetic force? (Narrow profiles mean that they are actually perpendicular to the page, seen edge on.) a) 1 and 2 only b) 3 only c) 4 only d) All of them e) None of them I 1 2 3 4

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Lecture 17-2 Motional EMF of Sliding Conductor Lenz’s Law gives direction Induced EMF: counter-clockwise Faraday’s Law B d dx Bl Blv dt dt       This EMF induces current I Blv I RR   Magnetic force F M acts on this I 22 M B l v F I lB R  F M decelerates the bar dv B l v m dt R  dv B l dt v mR   ( ) 0 Bl t mR v t v e    
Lecture 17-3 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   Accumulates conduction electrons near bottom, or E down develops, opposing the accumulation per electron on average Equilibrium is reached when EB F eE F   E v B    V EL vBL Potential difference between the ends of rod More generally,   || || V E L v B L induced emf L

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Lecture 17-4 4 Application of Faraday’s Law of Induction Generators and Motors Faraday’s Law of Induction can be applied to the generation and use of electric current A device that produces electric current from mechanical motion is called a generator A device that produces mechanical motion from electric current is called a motor
Lecture 17-5 Alternating Current (AC) = Electric current that changes direction periodically ac generator is a device which creates an ac emf/current.

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Lecture17_Kim - Lecture 17-1 Physics 241 Question 1 The...

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