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Chapter 27: Circuits

Fundamentals Of Physics
Pages: 771 - 802

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118 Questions for Chapter 27: Circuits

  1. Cap-monster maze.In Fig. 27-22, all the capacitors have a capacitance of60μC, and all the batteries have an emf of 10 V. What is the charge on capacitor C? (If you can find the proper loop through this maze, you can answer the question with a few seconds of mental calculation).

    Found on Page 794
  2. After the switch in Fig. 27-15 is closed on point a, there is current ithrough resistance R. Figure 27-23 gives that current for four sets of values of Rand capacitance C: (1)R0andC0, (2)2R0andC0, (3)R0and2C0, (4)2R0and2C0. Which set goes wi

    Found on Page 795
  3. The current in a single-loop circuit with one resistance Ris 5.0 A. When an additional resistance of 2.0Ωis inserted in series with R, the current drops to 4.0 A. What is R?

    Found on Page 795
  4. When resistors 1 and 2 are connected in series, the equivalent resistance is 16.0 Ω. When they are connected in parallel, the equivalent resistance is 3.0 Ω. What are the smaller resistance and the larger resistance of these two resistors?

    Found on Page 795
  5. In Figure, the ideal batteries have emfs ε1=150 V andε2=50 V and the resistances areR1=3.0 Ω andR2=2.0 Ω. If the potential at Pis 100 V, what is it at Q

    Found on Page 795
  6. You are to connect resistors R1and R2, withR1>R2, to a battery, first individually, then in series, and then in parallel. Rank those arrangements according to the amount of current through the battery, greatest first.

    Found on Page 793
  7. A copper wire of radius a=0.250mmhas an aluminium jacket of outer radiusb=0.380mm. There is a currenti=2.00Ain the composite wire. Using Table 26-1, calculate the current in (a) the copper and (b) the aluminium. (c) If a potential differenceV=12.0Vbetween the ends maintains the current, what is the length of the composite wire?

    Found on Page 798
  8. In Fig. 27-53, the resistors have the values R1=7.00Ω, R2=12.00Ω, and R3=4.00Ω, and the ideal battery’s emf isε=24.0V. For what value of R4will the rate at which the battery transfers energy to the resistors equal (a)60.0 W, (b) the maximum possible rate Pmax, and (c) the minimum possible rate Pmin? What are (d)Pmaxand (e)Pmin?

    Found on Page 798
  9. A simple ohmmeter is made by connecting a 1.50 Vflashlight battery in series with a resistanceRand an ammeter that reads from 0 to1.00 mA, as shown in Fig. 27-59. ResistanceRis adjusted so that when the clip leads are shorted together, the meter deflects to its full-scale value of1.00mA. What external resistance across the leads results in a deflection of (a) 10.0%, (b) 50.0%, and (c) 90.0%of full scale? (d) If the ammeter has a resistance of20.0Ωand the internal resistance of the battery is negligible, what is the value ofR

    Found on Page 798
  10. When the lights of a car are switched on, an ammeter in series with them reads10.0 Aand a voltmeter connected across them reads12.0 V(Fig. 27-60). When the electric starting motor is turned on, the ammeter reading drops to8.00 Aand the lights dim somewhat. If the internal resistance of the battery is0.0500 ohmand that of the ammeter is negligible, what are (a) the emf of the battery and (b) the current through the starting motor when the lights are on?

    Found on Page 799

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