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chp34_6 - Example terminal velocity A long rectangular loop...

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PHY2061 R. D. Field Department of Physics chp34_6.doc University of Florida Induction Examples Example ( simple generator ): A conducting rod of length L is pulled along horizontal, frictionless, conducting rails at a constant speed v . A uniform magnetic field ( out of the paper ) fills the region in which the rod moves. The rails and the rod have negligible resistance but are connected by a resistor R . What is the induced EMF in the loop? What is the induced current in the loop? At what rate is thermal energy being generated in the resistor? What force must be applied to the rod by an external agent to keep it in uniform motion? At what rate does this external agent do work on the system?
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Unformatted text preview: Example ( terminal velocity ): A long rectangular loop of wire of width L , mass M , and resistance R , falls vertically due to gravity out of a uniform magnetic field . Instead of falling with acceleration, g , the loop falls a constant velocity (called the terminal velocity ). What is the terminal velocity of the loop? Example ( non-uniform magnetic field ): A rectangular loop of wire with length a , width b , and resistance R is moved with velocity v away from an infinitely long wire carrying a current I . What is the induced current in the loop when it is a distance c from the wire? B-out v Rod R B-out Mg L a b v c I...
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