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Chapter 31: Electromagnetic Oscillations and Alternating Current

Fundamentals Of Physics
Pages: 903 - 940

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106 Questions for Chapter 31: Electromagnetic Oscillations and Alternating Current

  1. An air conditioner connected to a 120 V RMS ac line is equivalent to a12.0Ω resistance and a 1.30Ωinductive reactance in series. (a) Calculate the impedance of the air conditioner. (b) Calculate the average rate at which energy is supplied to the appliance.

    Found on Page 938
  2. What is the maximum value of an ac voltage whose RMS value is 100 V?

    Found on Page 938
  3. What direct current will produce the same amount of thermal energy, in a particular resistor, as an alternating current that has a maximum value of 2.60 A?

    Found on Page 938
  4. LCoscillators have been used in circuits connected to loudspeakers to create some of the sounds of electronic music. What inductance must be used with a 6.7 µF capacitor to produce a frequency of10 kHz, which is near the middle of the audible range of frequencies?

    Found on Page 936
  5. Figure 31-24 shows three situations like those in Fig. 31-15. Is the driving angular frequency greater than, less than, or equal to the resonant angular frequency of the circuit in (a) situation 1, (b) situation 2, and (c)situation 3?

    Found on Page 935
  6. A variable capacitor with a range from 10 to 365pF is used with a coil to form a variable-frequency LCcircuit to tune the input to a radio. (a) What is the ratio of maximum frequency to minimum frequency that can be obtained with such a capacitor? If this circuit is to obtain frequencies from 0.54 MHz to 1.6 0MHz, the ratio computed in (a) is too large. By adding a capacitor in parallel to the variable capacitor, this range can be adjusted. To obtain the desired frequency range,(b) What capacitance should be added ? (c) What inductance should the coil have?

    Found on Page 936
  7. Question: Figure 31-25 shows the current i and driving emfωdfor a series RLC circuit. Relative to the emf curve, does the current curve shift leftward or rightward and does the amplitude of that curve increase or decrease if we slightly increase (a) L, (b) C, and (c) ωd?

    Found on Page 935
  8. In an oscillating LCcircuit, when 75% of the total energy is stored in the inductor’s magnetic field,(a) What multiple of the maximum charge is on the capacitor? (b) What multiple of the maximum current is in the inductor?

    Found on Page 936
  9. Figure 31-25 shows the currentand driving emf εfor a series RLC circuit. (a) Does the current lead or lag the emf? (b) Is the circuit’s load mainly capacitive or mainly inductive? (c) Is the angular frequency ωdof the emf greater than or less than the natural angular frequency ω

    Found on Page 935
  10. In an oscillating LCcircuit,L=3.00mHandC=2.70μF. Att=0the 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 timet>0is the rate at which energy is stored in the capacitor greatest, and (c) What is that greate

    Found on Page 936

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