# HW17soln - 29-45 In the circuit shown the capacitor has...

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Physics 21 Fall 2007 Solution to HW-17 29-25 The conducting rod shown in the figure makes contact with the metal rails. The apparatus is in a uniform magnetic field B perpendicular to the plane of the figure. (A) Find the magnitude of the emf induced in the rod when it is moving toward the right with a speed v . (B) In what direction does the current flow in the rod? If the resistance of the circuit is R (assumed to be constant), find (C) the magnitude and (D) the direction of the force required to keep the rod moving to the right with a constant speed v . (E) Compare the rate at which mechanical work is done by the force ( Fv ) with the rate at which thermal energy is developed in the circuit ( I ^2 R ). 30-19 An inductor with an inductance of 2.20 H and a resistance of R = 7.70 is connected to the terminals of a battery with an emf of 6.50 V and negligible internal resistance. (A) Find the initial rate of increase of current in the circuit. (B) Find the rate of increase of current at the instant when the current is 0.530 A. (C)

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## This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

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HW17soln - 29-45 In the circuit shown the capacitor has...

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