2007 phy104 3rd Hour Test

# What is the first time at which the current i will be

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Unformatted text preview: the first time at which the current I will be maximum? What is the charge on C1 at this time? c) (5 points) Suppose instead that at time t = 0, switch S1 is closed. At a later time t1 , switch S1 is opened and S2 is simultaneously closed. At a still later time t2 , switch S2 is opened again. What are the shortest times t1 and t2 (measured from t = 0) such that C2 will be maximally charged? (Assume no energy is lost to sparking in this process.) Physics 104 3rd Hour Examination, April 18, 2006 Problem 3. (15 points) Problem 3, Page 6 Consider the series LRC circuit shown in the figure, in which an AC voltage is supplied by a generator. Answer the following questions. R E = Eo cos( t) L C Figure 3: An LRC circuit. a) (4 points) In such a circuit, is the phase difference between the voltage drop across the capacitor and the voltage drop across the inductor zero? If not, what is it? b) (4 points) Is the average power dissipated by the resistor equal to zero? If not, what is it? Physics 104 3rd Hour Examination, April 18, 2006 Problem 3, Page 7 c) (4 points) At resonance, does the impedance of the circuit equal the resistance? Show why or why not. d) (3 points) At resonance, are the current and generator voltage in phase? Why or why not?...
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