Question 1

Kirchhoff's rules: A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The emf ε is closest to

Accepted Answer

A)  +3 V. 
B)  +19 V. 
C)  -3 V. 
D)  -10 V. 
E)  -1 V. 
A)  +3 V. 
B)  +19 V. 
C)  -3 V. 
D)  -10 V. 
E)  -1 V.

Question 2

RC circuits: A 4.0-mF capacitor is discharged through a 4.0-kΩ resistor. How long will it take for the capacitor to lose half its initial stored energy?

Accepted Answer

A)  9.2 s 
B)  2.7 s 
C)  10.2 s 
D)  5.5 s 
E)  1.6 s 
A)  9.2 s 
B)  2.7 s 
C)  10.2 s 
D)  5.5 s 
E)  1.6 s

Question 3

Kirchhoff's rules: Consider the circuit shown in the figure. Note that two currents are shown. Calculate the emfs ε1 and ε3.

Accepted Answer

Question 4

RC circuits: An uncharged 30.0-µF capacitor is connected in series with a 25.0-Ω resistor, a DC battery, and an open switch. The battery has an internal resistance of 10.0 Ω and the open-circuit voltage across its terminals is 50.0 V. The leads have no appreciable resistance. At time t = 0, the switch is suddenly closed.
(a) What is the maximum current through the 25.0-Ω resistor and when does it occur (immediately after closing the switch or after the switch has been closed for a long time)?
(b) What is the maximum charge that the capacitor receives?
(c) When the current in the circuit is 0.850 A, how much charge is on the plates of the capacitor?

Accepted Answer

(a) 1.43 A, immediat

Question 5

RC circuits: For the circuit shown in the figure, the switch S is initially open and the capacitor voltage is 80 V. The switch is then closed at time t = 0. How long after closing the switch will the current in the resistor be 7.0 µA?

Accepted Answer

A)  87 s 
B)  95 s 
C)  78 s 
D)  69 s 
E)  61 s 
A)  87 s 
B)  95 s 
C)  78 s 
D)  69 s 
E)  61 s

Question 6

Meters: A galvanometer G has an internal resistance rg. A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance Rs. Which one of the figures below is the most appropriate circuit diagram for the voltmeter?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 7

Resistors in combination: In the circuit shown in the figure, all the lightbulbs are identical. Which of the following is the correct ranking of the brightness of the bulbs?

Accepted Answer

A)  B and C have equal brightness, and A is the dimmest. 
B)  A and B have equal brightness, and C is the dimmest. 
C)  A is brightest, C is dimmest, and B is in between. 
D)  A is the brightest, and B and C have equal brightness but less than A. 
E)  All three bulbs have the same brightness. 
A)  B and C have equal brightness, and A is the dimmest. 
B)  A and B have equal brightness, and C is the dimmest. 
C)  A is brightest, C is dimmest, and B is in between. 
D)  A is the brightest, and B and C have equal brightness but less than A. 
E)  All three bulbs have the same brightness.

Question 8

Resistors in combination: For the circuit shown in the figure, all quantities are accurate to 3 significant figures. What is the power dissipated in the 2-Ω resistor?

Accepted Answer

A)  5.33 W 
B)  8.0 W 
C)  6.67 W 
D)  2.67 W 
E)  3.56 W 
A)  5.33 W 
B)  8.0 W 
C)  6.67 W 
D)  2.67 W 
E)  3.56 W

Question 9

Kirchhoff's rules: For the circuit shown in the figure, determine the current in
(a) the 7.0-Ω resistor.
(b) the 8.0-Ω resistor.
(c) the 4.0-Ω resistor.

Accepted Answer

(a) 1.6 A

Question 10

Meters: A galvanometer with a resistance of 40.0 Ω deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?

Accepted Answer

A)  25 kΩ 
B)  27 kΩ 
C)  29 kΩ 
D)  31 kΩ 
E)  35 kΩ 
A)  25 kΩ 
B)  27 kΩ 
C)  29 kΩ 
D)  31 kΩ 
E)  35 kΩ

Question 11

Resistors in combination: In the circuit shown in the figure, an ideal ohmmeter is connected across ab with the switch S open. All the connecting leads have negligible resistance. The reading of the ohmmeter will be closest to

Accepted Answer

A)  7.5 Ω. 
B)  10 Ω. 
C)  30 Ω. 
D)  40 Ω. 
E)  60 Ω. 
A)  7.5 Ω. 
B)  10 Ω. 
C)  30 Ω. 
D)  40 Ω. 
E)  60 Ω.

Question 12

Internal battery resistance: When a 100-Ω resistor is connected across the terminals of a battery of emf ε and internal resistance r, the battery delivers 0.794 W of power to the 100-Ω resistor. When the 100-Ω resistor is replaced by a 200-Ω resistor, the battery delivers 0.401 W of power to the 200-Ω resistor. What are the emf and internal resistance of the battery?

Accepted Answer

A)  ε = 10.0 V, r = 5.02 Ω 
B)  ε = 4.50 V, r = 4.00 Ω 
C)  ε = 9.00 V, r = 2.04 Ω 
D)  ε = 9.00 V, r = 1.01 Ω 
E)  ε = 12.0 V, r = 6.00 Ω 
A)  ε = 10.0 V, r = 5.02 Ω 
B)  ε = 4.50 V, r = 4.00 Ω 
C)  ε = 9.00 V, r = 2.04 Ω 
D)  ε = 9.00 V, r = 1.01 Ω 
E)  ε = 12.0 V, r = 6.00 Ω

Question 13

Kirchhoff's rules: A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. The current I2 is closest to

Accepted Answer

A)  -6 A. 
B)  6 A. 
C)  8 A. 
D)  -8 A. 
E)  zero. 
A)  -6 A. 
B)  6 A. 
C)  8 A. 
D)  -8 A. 
E)  zero.

Question 14

Resistors in combination: The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals. What happens to the brightness of lightbulb 1 when the switch S is closed?

Accepted Answer

A)  The brightness will increase momentarily then return to its previous level. 
B)  The brightness increases permanently. 
C)  The brightness will decrease momentarily then return to its previous level. 
D)  The brightness remains the same as before the switch is closed. 
E)  The brightness decreases permanently. 
A)  The brightness will increase momentarily then return to its previous level. 
B)  The brightness increases permanently. 
C)  The brightness will decrease momentarily then return to its previous level. 
D)  The brightness remains the same as before the switch is closed. 
E)  The brightness decreases permanently.

Question 15

Meters: In the circuit shown in the figure, two 360.0-Ω resistors are connected in series with an ideal source of emf. A voltmeter with internal resistance of 6350 Ω is connected across one of the resistors and reads 3.23 V. Find the emf of the source.

Accepted Answer

The answer of Meters: In the circuit shown in the...

Question 16

Resistors in combination: A 5.0-Ω resistor and a 9.0-Ω resistor are connected in parallel. A 4.0-Ω resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination of the three resistors. What is the current through
(a) the 4.0-Ω resistor?
(b) the 5.0-Ω resistor?
(c) the 9.0-Ω resistor?

Accepted Answer

(a) 0.83 A

Question 17

Resistors in combination: A 4.00-Ω resistor, an 8.00-Ω resistor, and a 24.0-Ω resistor are connected together.
(a) What is the maximum resistance that can be produced using all three resistors?
(b) What is the minimum resistance that can be produced using all three resistors?
(c) How would you connect these three resistors to obtain a resistance of 10.0 Ω?
(d) How would you connect these three resistors to obtain a resistance of 8.00 Ω?

Accepted Answer

(a) 36.0 Ω 
(b) 2.40 Ω
(c) Connect the 8

Question 18

Internal battery resistance: When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery, the voltage across the terminals of the battery falls by 0.300 V. What is the internal resistance of this battery?

Accepted Answer

A)  3.60 Ω 
B)  1.56 Ω 
C)  0.98 Ω 
D)  0.30 Ω 
E)  0.51 Ω 
A)  3.60 Ω 
B)  1.56 Ω 
C)  0.98 Ω 
D)  0.30 Ω 
E)  0.51 Ω

Question 19

RC circuits: For the circuit shown in the figure, the capacitors are all initially uncharged, the connecting leads have no resistance, the battery has no appreciable internal resistance, and the switch S is originally open.   (a) Just after closing the switch S, what is the current in the 15.0-Ω resistor? 
A) 0.00 A
B) 1.67 A
C) 2.50 A
D) 3.33 A
E) 5.00 A
(b) After the switch S has been closed for a very long time, what is the potential difference across the 28.0-μF capacitor?
A) 0.00 V
B) 25.0 V
C) 3.33 V
D) 37.5 V
E) 50.0 V

Accepted Answer

The answer of RC circuits: For the circuit shown in...

Question 20

RC circuits: An uncharged 1.0-μF capacitor is connected in series with a   resistor, an ideal   battery, and an open switch. What is the voltage across the capacitor   after closing the switch?

Accepted Answer

A)  2.7 V 
B)  1.6 V 
C)  2.6 V 
D)  0.62 V 
A)  2.7 V 
B)  1.6 V 
C)  2.6 V 
D)  0.62 V

Exam 22: Gausss Law

Kirchhoff's rules: A multiloop circuit is shown in the figure. Some circuit quantities are not labeled. It is not necessary to solve the entire circuit. The emf ε is closest to

RC circuits: A 4.0-mF capacitor is discharged through a 4.0-kΩ resistor. How long will it take for the capacitor to lose half its initial stored energy?

Kirchhoff's rules: Consider the circuit shown in the figure. Note that two currents are shown. Calculate the emfs ε1 and ε3.

RC circuits: For the circuit shown in the figure, the switch S is initially open and the capacitor voltage is 80 V. The switch is then closed at time t = 0. How long after closing the switch will the current in the resistor be 7.0 µA?

Meters: A galvanometer G has an internal resistance rg. A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance Rs. Which one of the figures below is the most appropriate circuit diagram for the voltmeter?

Resistors in combination: In the circuit shown in the figure, all the lightbulbs are identical. Which of the following is the correct ranking of the brightness of the bulbs?

Resistors in combination: For the circuit shown in the figure, all quantities are accurate to 3 significant figures. What is the power dissipated in the 2-Ω resistor?

Kirchhoff's rules: For the circuit shown in the figure, determine the current in (a) the 7.0-Ω resistor. (b) the 8.0-Ω resistor. (c) the 4.0-Ω resistor.

Meters: A galvanometer with a resistance of 40.0 Ω deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?

Resistors in combination: In the circuit shown in the figure, an ideal ohmmeter is connected across ab with the switch S open. All the connecting leads have negligible resistance. The reading of the ohmmeter will be closest to

Kirchhoff's rules: A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. The current I2 is closest to

Resistors in combination: The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals. What happens to the brightness of lightbulb 1 when the switch S is closed?

Meters: In the circuit shown in the figure, two 360.0-Ω resistors are connected in series with an ideal source of emf. A voltmeter with internal resistance of 6350 Ω is connected across one of the resistors and reads 3.23 V. Find the emf of the source.

Internal battery resistance: When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery, the voltage across the terminals of the battery falls by 0.300 V. What is the internal resistance of this battery?

RC circuits: An uncharged 1.0-μF capacitor is connected in series with a resistor, an ideal battery, and an open switch. What is the voltage across the capacitor after closing the switch?

Motion Along a Straight Line

Motion in Two or Three Dimensions

Newtons Laws of Motion

Applying Newtons Laws

Work and Kinetic Energy

Potential Energy and Energy Conservation

Momentum, Impulse, and Collisions

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Dynamics of Rotational Motion

Equilibrium and Elasticity

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The First Law of Thermodynamics

The Second Law of Thermodynamics

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Direct-Current Circuits

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Sources of Magnetic Field

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Inductance

Alternating Current

Electromagnetic Waves Optics

The Nature and Propagation of Light

Geometric Optics

Interference

Filters

Kirchhoff's rules: Consider the circuit shown in the figure. Note that two currents are shown. Calculate the emfs ε₁ and ε₃.

Meters: A galvanometer G has an internal resistance r_g. A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance R_s. Which one of the figures below is the most appropriate circuit diagram for the voltmeter?

Kirchhoff's rules: A multiloop circuit is shown in the figure. It is not necessary to solve the entire circuit. The current I₂ is closest to