COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 35QAP
To determine
The drift speed of the electrons in the wire.
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A potential difference of 7.50 V is applied between
y and c in Figure 18-28. (a) Find the difference in potential
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18-6 The rate at which energy is produced or taken in
ircuit element depends on current and voltage
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18-8
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b
65 2
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60 2
Figure 18-28 Problem 62
18-6
87 The circuit of Fig. 27-75 shows a
capacitor, two ideal batteries, two
resistors, and a switch S. Initially S has
been open for a long time. If it is then
closed for a long time, what is the
change in the charge on the capacitor?
Assume C = 10 µF, E, = 1.0 V, 82 = 3.0 Figure 27-75 Problem 87.
V, R = 0.20 0, and R2 = 0.40 N.
R2
94 Figure 27-79 shows three 20.0 2
resistors. Find the equivalent resist-
ance between points (a) A and B, (b)
A and C, and (c) B and C. (Hint: A
Imagine that a battery is connected
between a given pair of points.)
Figure 27-79 Problem 94.
Chapter 18 Solutions
COLLEGE PHYSICS
Ch. 18 - Prob. 1QAPCh. 18 - Prob. 2QAPCh. 18 - Prob. 3QAPCh. 18 - Prob. 4QAPCh. 18 - Prob. 5QAPCh. 18 - Prob. 6QAPCh. 18 - Prob. 7QAPCh. 18 - Prob. 8QAPCh. 18 - Prob. 9QAPCh. 18 - Prob. 10QAP
Ch. 18 - Prob. 11QAPCh. 18 - Prob. 12QAPCh. 18 - Prob. 13QAPCh. 18 - Prob. 14QAPCh. 18 - Prob. 15QAPCh. 18 - Prob. 16QAPCh. 18 - Prob. 17QAPCh. 18 - Prob. 18QAPCh. 18 - Prob. 19QAPCh. 18 - Prob. 20QAPCh. 18 - Prob. 21QAPCh. 18 - Prob. 22QAPCh. 18 - Prob. 23QAPCh. 18 - Prob. 24QAPCh. 18 - Prob. 25QAPCh. 18 - Prob. 26QAPCh. 18 - Prob. 27QAPCh. 18 - Prob. 28QAPCh. 18 - Prob. 29QAPCh. 18 - Prob. 30QAPCh. 18 - Prob. 31QAPCh. 18 - Prob. 32QAPCh. 18 - Prob. 33QAPCh. 18 - Prob. 34QAPCh. 18 - Prob. 35QAPCh. 18 - Prob. 36QAPCh. 18 - Prob. 37QAPCh. 18 - Prob. 38QAPCh. 18 - Prob. 39QAPCh. 18 - Prob. 40QAPCh. 18 - Prob. 41QAPCh. 18 - Prob. 42QAPCh. 18 - Prob. 43QAPCh. 18 - Prob. 44QAPCh. 18 - Prob. 45QAPCh. 18 - Prob. 46QAPCh. 18 - Prob. 47QAPCh. 18 - Prob. 48QAPCh. 18 - Prob. 49QAPCh. 18 - Prob. 50QAPCh. 18 - Prob. 51QAPCh. 18 - Prob. 52QAPCh. 18 - Prob. 53QAPCh. 18 - Prob. 54QAPCh. 18 - Prob. 55QAPCh. 18 - Prob. 56QAPCh. 18 - Prob. 57QAPCh. 18 - Prob. 58QAPCh. 18 - Prob. 59QAPCh. 18 - Prob. 60QAPCh. 18 - Prob. 61QAPCh. 18 - Prob. 62QAPCh. 18 - Prob. 63QAPCh. 18 - Prob. 64QAPCh. 18 - Prob. 65QAPCh. 18 - Prob. 66QAPCh. 18 - Prob. 67QAPCh. 18 - Prob. 68QAPCh. 18 - Prob. 69QAPCh. 18 - Prob. 70QAPCh. 18 - Prob. 71QAPCh. 18 - Prob. 72QAPCh. 18 - Prob. 73QAPCh. 18 - Prob. 74QAPCh. 18 - Prob. 75QAPCh. 18 - Prob. 76QAPCh. 18 - Prob. 77QAPCh. 18 - Prob. 78QAPCh. 18 - Prob. 79QAPCh. 18 - Prob. 80QAPCh. 18 - Prob. 81QAPCh. 18 - Prob. 82QAPCh. 18 - Prob. 83QAPCh. 18 - Prob. 84QAPCh. 18 - Prob. 85QAPCh. 18 - Prob. 86QAPCh. 18 - Prob. 87QAPCh. 18 - Prob. 88QAPCh. 18 - Prob. 89QAPCh. 18 - Prob. 90QAPCh. 18 - Prob. 91QAPCh. 18 - Prob. 92QAP
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- A close analogy exists between the flow of energy by heat because of a temperature difference (see Section 19.6) and the flow of electric charge because of a potential difference. In a metal, energy dQ and electrical charge dq are both transported by free electrons. Consequently, a good electrical conductor is usually a good thermal conductor as well. Consider a thin conducting slab of thickness dx, area A, and electrical conductivity , with a potential difference dV between opposite faces. (a) Show that the current I = dq/dt is given by the equation on the left: ChargeconductionThermalconductiondqdt=A|dVdx|dQdt=kA|dTdx| In the analogous thermal conduction equation on the right (Eq. 19.17), the rate dQ/dt of energy flow by heat (in SI units of joules per second) is due to a temperature gradient dT/dx in a material of thermal conductivity k. (b) State analogous rules relating the direction of the electric current to the change in potential and relating the direction of energy flow to the change in temperature.arrow_forwardResidential building codes typically require the use of 12-gauge copper wire (diameter 0.205 cm) for wiring receptacles. Such circuits carry currents as large as 20.0 A. If a wire of smaller diameter (with a higher gauge number) carried that much current, the wire could rise to a high temperature and cause a fire. (a) Calculate the rate at which internal energy is produced in 1.00 m of 12-gauge copper wire carrying 20.0 A. (b) Repeat the calculation for a 12-gauge aluminum wire. (c) Explain whether a 12-gauge aluminum wire would be as safe as a copper wire.arrow_forwardCalculate how many electrons pass per second through a conductive wire connected to a 100W lamp at 127 V. Repeat calculations for a 100 W lamp at 220 V.arrow_forward
- 9- 20F The capacitor is connected for a long time in the circuit. What is the current leaving the battery? A) 5A B) 6.25 A C) 3 A D) 4 A E) 0.67 Aarrow_forward4) You typically don't think of air being an insulator, but it is, though not perfect. Dry air does have a high resistivity of 3 x 1013 Qm. Two square plates, 10 cm on a side, are separated by 1.2 mm separated by dry air. Charging these plates, a capacitor is created, and potential difference of 250 V is created. What fraction of the charge will flow across the air gap in 1 minute? Note that the potential difference of 250 V is held fixed and constant.arrow_forward36. Example 24.3: An electrolyzer passes electric current through water, dissociating some of the water molecules and thus pro- ducing hydrogen (H,) and oxygen (0,) gas. Electrolyzers pow- ered by renewable wind and solar energy sources could produce hydrogen for fuel-cell vehicles. In an experimental electrolyzer, current flows through a cylindrical tube of diameter 6.85 cm. The tube contains an alkaline solution that decreases the resistivity to 0.0466 N-m. If the tube carries 18.7 A, what are (a) the current density and (b) the electric field in the solution?arrow_forward
- 4) In the figure below, battery Bị is recharging battery Bz. The current through B, and the potential across B2 may be (a) 3 A and 4 V. (b) 2 A and 5 V, or (c) 6 A and 2 V. Rank these pairs of values according to the rate at which electric energy is transferred from B1 to Bz, greatest first. B1 B2arrow_forwardIn the circuit shown switch S has been closed 60 0 for a long time. a) Find the charge in the capacitor b) The switch is now open how long will it take to deplete 90% of the capacitors charge? (Ans. 80 µC, 0.23 ms) 10 0 100V_ 40Q 2 uF Iarrow_forward-4 If the magnitude of the drift velocity of free electrons in a copper wire is 8.56 x 10* m/s, what is the electric field in the conductor? V/marrow_forward
- Additional Problems 70 Go Each of the six real batteries in Fig. 27-68 has an emf of 20 V and a resistance of 4.0 n. (a) What is the current through the (external) resistance R = 4.0 0? (b) What is the potential difference across each battery? (c) What is the power of each battery? (d) At what rate does each battery transfer energy to internal thermal energy? Figure 27-68 Problem 70.arrow_forwardA 58 F capacitor and a 471 resistor are connected to a battery of voltage 7 V as shown in the circuit. After closing the switch, when the capacitor voltage is half of battery voltage how much energy is stored in the capacitor? Express your answer in Joules (J) E 41- 7 C Rarrow_forward100 80 60- 40 20 0 v (V) - 20--- - 40 - 60 1 1 I 1 1 I 1 2 3 4 5 6 7 8 9 L 10 11 12 13 14 15 / (ms) Find the average current (in mA) at t = 5 ms if the voltage across 0.06 uF capacitor is shown in the above figure.arrow_forward
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