Essential University Physics
4th Edition
ISBN: 9780134988566
Author: Wolfson, Richard
Publisher: Pearson Education,
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Textbook Question
Chapter 25, Problem 76P
The circuit in Fig. 25.39 extends forever to the right, and all the resistors have the same value R. Show that the equivalent resistance measured across the two terminals at left is
FIGURE 25.39 Problem 74
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R1
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2. Find the charge on the capacitor after the switch has been left open for some
time, then closed for some period of time. We can assume that C = 2 µF, with
batteries of values E1 = 2V and E2 = 1 V, and resistor values R1
R2 = 0.25 2.
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Given two batteries: one with voltage Vand internal resistance r1; another with also voltage Vand internal resistance r2. Which of the
following is true if we connect them in parallel the positive terminal of one connected to the negative of the other?
O The answer cannot be found on the other choices.
The total voltage will be V, while the total internal resistance is (r1-1 + r21)1.
No voltage will remain, while the total internal resistance is (rıi
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O The total voltage will be 2V, while the total internal resistance is (r11 + r2)1.
What is the voltage between points a andb (AVab = Vb-Va) if R1 = 4.00 Q, R2 and R3 are unknown,
R4=8.00 Q and R5=D4.00 Q, the equivalent resistance of the circuit is 7.34 2, and ɛ = 7.00 V. Pay
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Chapter 25 Solutions
Essential University Physics
Ch. 25.1 - The figure shows three circuits. Which are...Ch. 25.2 - Rank front highest to lowest the voltages across...Ch. 25.2 - The figure shows all four possible combinations of...Ch. 25.2 - The figure shows a circuit with three identical...Ch. 25.3 - Which circuit(s) cannot be analyzed using series...Ch. 25.4 - All resistors in the figure have the same value...Ch. 25.5 - A capacitor is charged to 12 V and then connected...Ch. 25 - Are household electrical outlets connected in...Ch. 25 - Can the voltage across a batterys terminals differ...Ch. 25 - Can the voltage across a batterys terminals he...
Ch. 25 - When the switch in Fig. 25.25 is open, whats the...Ch. 25 - Two identical resistors in series dissipate equal...Ch. 25 - When a large electric load such as a washing...Ch. 25 - How would you connect a pair of equal resistors...Ch. 25 - You have a battery whose voltage and internal...Ch. 25 - A student whos confused about voltage and current...Ch. 25 - A student whos confused about voltage and current...Ch. 25 - Sketch a circuit diagram for a circuit that...Ch. 25 - Sketch a diagram for a circuit consisting of two...Ch. 25 - Resistors R1 and R2 are in series, and the series...Ch. 25 - Whats the emf of a battery that delivers 27 J of...Ch. 25 - A 1.5-V battery stores 4.5 kJ of energy. How long...Ch. 25 - If you accidentally leave your car headlights...Ch. 25 - A 47-k resistor and a 39-k resistor are in...Ch. 25 - What resistance should you place in parallel with...Ch. 25 - A defective starter motor draws 285 A from a car's...Ch. 25 - Find the internal resistance of the battery in...Ch. 25 - When a 9-V battery is temporarily short-circuited,...Ch. 25 - You have a 1.0-, a 2.0-, and a 3.0- resistor. What...Ch. 25 - Find all three currents in the circuit of Fig....Ch. 25 - Prob. 24ECh. 25 - Find all three currents in the circuit of Fig....Ch. 25 - Prob. 26ECh. 25 - An ammeter with 100- resistance is inserted in the...Ch. 25 - A new mechanic foolishly connects an ammeter with...Ch. 25 - Show that the quantity RC has the units of time...Ch. 25 - If capacitance is in F, what will he the units of...Ch. 25 - Show that a capacitor is charged to approximately...Ch. 25 - An uncharged 10-F capacitor and a 470-k resistor...Ch. 25 - Find an expression for the voltage across the...Ch. 25 - Rework Example 25.3. changing the 4.0- Ω resistor...Ch. 25 - Example 25.3: In the circuit of Example 25.3, take...Ch. 25 - Example 25.3: In Fig. 25.27, take R1 = R2 = 33.0 Ω...Ch. 25 - Example 25.3 In Fig. 25.27, take R1 = 220 Ω, R2 =...Ch. 25 - A professional-grade camera flash gets its energy...Ch. 25 - You're reengieering the camera flash of the...Ch. 25 - Defibrillators restore normal heart rhythm by...Ch. 25 - Example 25.5: You’re designing a defibrillator as...Ch. 25 - In Fig. 25.28, all resistors have the same value,...Ch. 25 - In Fig. 25.28, take all resistors to be 1 k Find...Ch. 25 - Three 1.5-V batteries, with internal resistances...Ch. 25 - Prob. 45PCh. 25 - You company is designing a battery-based backup...Ch. 25 - In the circuit of Fig. 25.30, find (a) the current...Ch. 25 - In Fig. 25.30, how much power is dissipated in the...Ch. 25 - Whats the ammeter reading in Fig. 25.31? FIGURE...Ch. 25 - Find all three currents in the circuit of Fig....Ch. 25 - In Example 25.4. ε2, is taken to be +9 V in the...Ch. 25 - The voltage across the 30-k resistor in Fig. 25.33...Ch. 25 - In Fig. 25.34, what are the meter readings when an...Ch. 25 - Prob. 55PCh. 25 - The voltage across a charging capacitor in an RC...Ch. 25 - Youre designing an external defibrillator that...Ch. 25 - A capacitor is charged until it holds 5.0 J of...Ch. 25 - A capacitor is charged until it holds 5.0 J of...Ch. 25 - In Fig. 25.35 the 2.0-F capacitor is charged to...Ch. 25 - For the circuit of Example 25.6, take = 100 V,...Ch. 25 - In Fig. 25.36, the switch is initially open and...Ch. 25 - Prob. 63PCh. 25 - An ammeter with resistance 1.42 is connected...Ch. 25 - In Fig. 25.37, take 1 = 12.0 V, 2 = 6.00 V, 3 =...Ch. 25 - With all values except 2 as given in the preceding...Ch. 25 - The voltage on a charged capacitor is monitored...Ch. 25 - Find the resistance needed in an RC circuit to...Ch. 25 - Suppose the currents into and out of a circuit...Ch. 25 - Show that a battery delivers the most power when...Ch. 25 - Youre writing the instruction manual for a stereo...Ch. 25 - Show that only half the total energy drawn from a...Ch. 25 - Find the equivalent resistance between A and B for...Ch. 25 - Prob. 74PCh. 25 - Obtain an expression for the rate of increase...Ch. 25 - The circuit in Fig. 25.39 extends forever to the...Ch. 25 - Figure 25.40 on the next page shows the voltage...Ch. 25 - Figure 25.41 shows a portion of a circuit used to...Ch. 25 - An electrochemical impulse traveling along the...Ch. 25 - In Fig. 25.27, take R1 = 47 Ω and R2 = 150 Ω....Ch. 25 - Write the node and loop equations for the circuit...Ch. 25 - Youre about to purchase a battery. Normally,...Ch. 25 - In the circuit of Fig. 25.42 the switch is...Ch. 25 - BIO Stray voltage is a serious problem on dairy...Ch. 25 - BIO Stray voltage is a serious problem on dairy...Ch. 25 - BIO Stray voltage is a serious problem on dairy...Ch. 25 - BIO Stray voltage is a serious problem on dairy...
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- In the circuit shown in (Figure 1) all meters are idealized and the batteries have no appreciable internal resistance. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of A complex network. Figure 25.0+ V 100.0 Ω a 115.0 S V 36 V 75.0 A Ω b 1 of 1 impi pitivas par Part C With the switch closed, find the reading of the voltmeter. Express your answer in volts. V = Submit Part D I = ΑΣΦ With the switch closed, find the reading of the ammeter. Express your answer in amperes. V7 ΑΣΦ Submit Request Answer Request Answer ? V Aarrow_forwardUsing your data, answer the following questions: a. To three decimal places, what fraction of the total charge does a capacitor in an RC circuit have after charging for 4.15 time constants; the fraction f such that q(4.15t) = fQmaxarrow_forwardThe shown circuit is connected for a long time. If C=24 µF and e=5.4 V, then find the charge on the capacitor (in uC). 2R ww.arrow_forward
- In the circuit, R= 30.0 kN and C = 0.100 µF. The capacitor is allowed to charge fully, and then the switch is changed from position a to position b. What will the voltage across the resistor be 8.40 ms later? R where X = 64.1 V.arrow_forwardin the curcuit shown in the figure , the S switch is closed at t = 0 and the capacitors, which are completely empty, begin to fill. Here E = 20 V , C = 4uF and R = 30 ohm. a) what is the time constant of the circuit , T in units of microseconds? b)when t=T , what is the total charge , in units of microcloumb accumulated in the capacitors ?arrow_forwardIn the circuit shown in the figure, the S switch closed at t=0 and the capacitors, which are completely empty, begin to fill. Here ε=10 V, C=5 μF and R=55 Ω. What is the time constant of the circuit, τ, in units of microseconds? When t= τ, what is the total charge, in units of microcoulomb, accumulated in the capacitors?arrow_forward
- Given two batteries: one with voltage V and internal resistance r₁; another with also voltage V and internal resistance r2. Which of the following is true if we connect them in series with the same polarity (facing the same direction)? O The total voltage will be V, while the total internal resistance will be r1 + 12. O The total voltage will be V, while the total internal resistance will be either r₁ or r2. No voltage will remain while the total internal resistance will be r₁ + 12. The total voltage will be 2V while the total internal resistance will be r₁ + r2.arrow_forwardIn Fig. 1, Vab =11.0 V, C1 =2.56 µF, C2 =6.58 µF, and C3 =9.42 %3D µF. The voltage across C3 is most nearly (A) 7.71 V. (B) 9.44 V. C1 (C) 1.51 V. (D) 4.40 V. C2 C3 (E) 8.81 V.arrow_forwardThe density of mobile electrons in copper metal is 8.4 x 1028 m³. Suppose that i = 7.2 x 1018 electrons/s are drifting through a copper wire. (This is a typical value for a simple circuit.) The diameter of the wire is 2.2 mm. In this case, about how many minutes would it take for a single electron in the electron sea to drift from one end to the other end of a wire 26 cm long? 405 X minutesarrow_forward
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