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Chapter 31: Q.62P (page 939)
A generator supplies 100 V to a transformer鈥檚 primary coil, which has50turns. If the secondary coil has 500 turns, what is the secondary voltage?
The secondary voltage is .
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Figure 31-20 shows graphs of capacitor voltage for
circuits 1 and 2, which contain identical capacitances and have the same, maximum charge Q. Are (a) the inductance L and (b) the maximum current I in circuit 1 greater than, less than, or the same as those in circuit?
In an oscillating LCcircuit,and. Atthe charge on the capacitor is zero and the current is2.00 A. (a) What is the maximum charge that will appear on the capacitor? (b) At what earliest timeis the rate at which energy is stored in the capacitor greatest, and (c) What is that greatest rate?
An alternating emf source with a certain emf amplitude is connected, in turn, to a resistor, a capacitor, and then an inductor. Once connected to one of the devices, the driving frequency is varied and the amplitude of the resulting current through the device is measured and plotted. Which of the three plots in Fig. 31-22 corresponds to which of the three devices?
A typical light dimmer used to dim the stage lights in a theater consists of a variable inductor L (whose inductance is adjustable between zero and Lmax) connected in series with a lightbulb B, as shown in Fig. 31-34. The electrical supply is at ; the light bulb is rated at 120 V, . (a) What is required if the rate of energy dissipation in the lightbulb is to be varied by a factor of 5 from its upper limit of 1000W? Assume that the resistance of the lightbulb is independent of its temperature. (b) Could one use a variable resistor (adjustable between zero and Rmax ) instead of an inductor? (c) If so, what Rmax is required? (d) Why isn鈥檛 this done?
Figure 31-32 shows a driven RLC circuit that contains two identical capacitors and two switches. The emf amplitude is set at , and the driving frequency is set at . With both switches open, the current leads the emf by . With switch closed and switch still open, the emf leads the current by . With both switches closed, the current amplitude is . What are (a) R, (b) C , and (c) L?
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