Question 1

The network shown is assembled with uncharged capacitors X ,Y,and Z,with 1 and S2 are initially open,and a potential difference Vab = 120 V is applied between points a and b.After the network is assembled,switch S1 is then closed,but switch S2 is kept open.What is the final potential difference across capacitor Z?   A) 100 V B) 600 V C) 55 V D) 38 V E) 29 V" class="answers-bank-image d-inline" rel="preload" >
1 and S2 are initially open,and a potential difference Vab = 120 V is applied between points a and b.After the network is assembled,switch S1 is then closed,but switch S2 is kept open.What is the final potential difference across capacitor Z?   A) 100 V B) 600 V C) 55 V D) 38 V E) 29 V" class="answers-bank-image d-inline" rel="preload" >
And 1 and S2 are initially open,and a potential difference Vab = 120 V is applied between points a and b.After the network is assembled,switch S1 is then closed,but switch S2 is kept open.What is the final potential difference across capacitor Z?   A) 100 V B) 600 V C) 55 V D) 38 V E) 29 V" class="answers-bank-image d-inline" rel="preload" >
The switches S1 and S2 are initially open,and a potential difference Vab = 120 V is applied between points a and b.After the network is assembled,switch S1 is then closed,but switch S2 is kept open.What is the final potential difference across capacitor Z? 1 and S2 are initially open,and a potential difference Vab = 120 V is applied between points a and b.After the network is assembled,switch S1 is then closed,but switch S2 is kept open.What is the final potential difference across capacitor Z?   A) 100 V B) 600 V C) 55 V D) 38 V E) 29 V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  100 V
B)  600 V
C)  55 V
D)  38 V
E)  29 VF) B) and C)
G) A) and E)

Question 2

A 1.0-μF capacitor is charged until it acquires a potential difference of  900.0 V. Across its plates,and then the emf source is removed.If the capacitor is then discharged through a  500.0-kΩ. Resistance,what is the voltage drop across the capacitor 9.0 ms.  After beginning the discharge?

Accepted Answer

A)  880 V
B)  920 V
C)  16 V
D)  -16 VE) A) and B)
F) All of the above

Question 3

A capacitor C is connected in series with a resistor R across a battery and an open switch.If a second capacitor of capacitance 2C is connected in series with the first one,the time constant of the new RC circuit will be

Accepted Answer

A)  the same as before.
B)  larger than before.
C)  smaller than before.
D)  variable.E) A) and D)
F) None of the above

Question 4

For the graph shown in the figure,what physical quantity does the slope of the graph represent for a dc circuit?

Accepted Answer

A)  resistivity
B)  resistance
C)  energy
D)  current
E)  capacitanceF) B) and E)
G) B) and D)

Question 5

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 Ω ∙ m?

Accepted Answer

A)  0.00012 Ω
B)  0.00021 Ω
C)  0.0012 Ω
D)  0.0021 ΩE) A) and D)
F) All of the above

Question 6

A simple circuit has a total resistance of 30 Ω.If a 2.0-A current is maintained in this circuit,how much energy is dissipated in this circuit in 4.0 seconds?

Accepted Answer

A)  24 J
B)  4.8 J
C)  48 J
D)  480 J
E)  6.0 JF) B) and C)
G) C) and D)

Question 7

When unequal resistors are connected in series across an ideal battery,

Accepted Answer

A)  the same power is dissipated in each one.
B)  the potential difference across each is the same.
C)  the current flowing in each is the same.
D)  the equivalent resistance of the circuit is less than that of the smallest resistor.
E)  the equivalent resistance of the circuit is equal to the average of all the resistances.F) D) and E)
G) A) and B)

Question 8

The resistivity of the material of a wire is 1.76 × 10-8 Ω ∙ m.If the diameter of the wire is 2.00 mm and its length is 2.00 m,what is its resistance?

Accepted Answer

A)  112 Ω
B)  11.2 Ω
C)  1.12 Ω
D)  0.112 Ω
E)  0.0112 ΩF) A) and B)
G) None of the above

Question 9

A 120-Ω laboratory resistor is rated at 0.25 W.How much current can safely flow through the resistor?

Accepted Answer

A)  30 A
B)  2.1 mA
C)  22 mA
D)  46 mAE) None of the above
F) All of the above

Question 10

When 5.00 A is flowing through an 10.0-Ω device,how much power is being dissipated in the device?

Accepted Answer

A)  50.0 W
B)  250 W
C)  500 W
D)  2.50 kWE) All of the above
F) None of the above

Question 11

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V,as shown in the figure.If the total current in the circuit is I = 5.0 A,what is the current through the 12-Ω resistor?

Accepted Answer

A)  1.7 A
B)  2.5 A
C)  0.56 A
D)  5.0 A
E)  0.75 AF) B) and E)
G) B) and D)

Question 12

What is the potential drop from point A to point B for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

Accepted Answer

A)  0.35 V
B)  2.0 V
C)  2.5 V
D)  3.0 VE) All of the above
F) A) and B)

Question 13

Three capacitors are connected as shown in the figure.What is the equivalent capacitance between points A and B?

Accepted Answer

A)  12 μF
B)  4.0 μC
C)  7.1 μF
D)  1.7 μF
E)  8.0 μFF) A) and C)
G) A) and D)

Question 14

In the circuit shown in the figure,R1 = 10 Ω,R2 = 12 Ω,R3 = 20 Ω,V1 = 1.0 V,V2 = 7.0 V,and the batteries are both ideal.What is the current through R1? 1 = 10 Ω,R2 = 12 Ω,R3 = 20 Ω,V1 = 1.0 V,V2 = 7.0 V,and the batteries are both ideal.What is the current through R1?   A) 0.60 A B) 0.80 A C) 0.18 A D) 0.13 A" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0.60 A
B)  0.80 A
C)  0.18 A
D)  0.13 AE) B) and C)
F) A) and B)

Question 15

Consider two copper wires with circular cross-sections and equal lengths.One wire has 3 times the diameter of the other.How do the resistances of these two wires compare?

Accepted Answer

A)  The thicker wire has 1/3 the resistance of the thinner wire.
B)  The thicker wire has 1/9 the resistance of the thinner wire.
C)  The thicker wire has 3 times the resistance of the thinner wire.
D)  The thicker wire has 9 times the resistance of the thinner wire.
E)  The thicker wire has  times the resistance of the thinner wire.F) A) and B)
G) All of the above

Question 16

A resistor is made out of a wire having a length L.When the ends of the wire are attached across the terminals of an ideal battery having a constant voltage V0 across its terminals,a current I flows through the wire.If the wire were cut in half,making two wires of length L/2,and both wires were attached across the terminals of the battery (the right ends of both wires attached to one terminal,and the left ends attached to the other terminal) ,how much current would the battery put out?

Accepted Answer

A)  4I
B)  2I
C)  I
D)  I/2
E)  I/4F) A) and E)
G) None of the above

Question 17

What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.

Accepted Answer

A)  950 Ω
B)  450 Ω
C)  392 Ω
D)  257 ΩE) A) and B)
F) A) and D)

Question 18

A kilowatt-hour is equivalent to

Accepted Answer

A)  1000 W.
B)  3600 J.
C)  3,600,000 J/s.
D)  3,600,000 J.
E)  3600 J/s.F) C) and D)
G) A) and C)

Question 19

The figure shows conventional current passing through a resistor.The arrow shows the direction in which this conventional current is flowing.Which of the following statements are correct? (There could be more than one correct choice. )

Accepted Answer

A)  The charges are moving slower at point b than at point a.
B)  The electric potential is lower at point b than at point a.
C)  The electric potential is higher at point b than at point a.
D)  The current at point b is the same as the current at point a.
E)  The electric potential at point b is the same as it is at point a.F) A) and D)
G) C) and E)

Question 20

For the circuit shown in the figure,C = 13 µF and R = 7.6 MΩ.Initially the switch S is open with the capacitor charged to a voltage of 80 V.The switch is then closed at time t = 0.00 s.What is the charge on the capacitor 40 s after closing the switch?

Accepted Answer

A)  3,300 µC
B)  3,100 µC
C)  2,900 µC
D)  2,700 µC
E)  2,500 µCF) A) and B)
G) B) and C)

Exam 21: Electric Current and Direct-Current Circuits

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10^-8 Ω ∙ m?

Correct Answer
verified

The resistivity of the material of a wire is 1.76 × 10^-8 Ω ∙ m.If the diameter of the wire is 2.00 mm and its length is 2.00 m,what is its resistance?

Correct Answer
verified

Consider two copper wires with circular cross-sections and equal lengths.One wire has 3 times the diameter of the other.How do the resistances of these two wires compare?

Correct Answer
verified

A 1.0-μF capacitor is charged until it acquires a potential difference of 900.0 V. Across its plates,and then the emf source is removed.If the capacitor is then discharged through a 500.0-kΩ. Resistance,what is the voltage drop across the capacitor 9.0 ms. After beginning the discharge?

Correct Answer
verified

What is the potential drop from point A to point B for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

Correct Answer
verified

When 5.00 A is flowing through an 10.0-Ω device,how much power is being dissipated in the device?

Correct Answer
verified

Correct Answer
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Three capacitors are connected as shown in the figure.What is the equivalent capacitance between points A and B?

Correct Answer
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For the circuit shown in the figure,C = 13 µF and R = 7.6 MΩ.Initially the switch S is open with the capacitor charged to a voltage of 80 V.The switch is then closed at time t = 0.00 s.What is the charge on the capacitor 40 s after closing the switch?

Correct Answer
verified

Correct Answer
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In the circuit shown in the figure,R₁ = 10 Ω,R₂ = 12 Ω,R₃ = 20 Ω,V₁ = 1.0 V,V₂ = 7.0 V,and the batteries are both ideal.What is the current through R₁?

Correct Answer
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What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.

Correct Answer
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For the graph shown in the figure,what physical quantity does the slope of the graph represent for a dc circuit?

Correct Answer
verified

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V,as shown in the figure.If the total current in the circuit is I = 5.0 A,what is the current through the 12-Ω resistor?

Correct Answer
verified

When unequal resistors are connected in series across an ideal battery,

Correct Answer
verified

A capacitor C is connected in series with a resistor R across a battery and an open switch.If a second capacitor of capacitance 2C is connected in series with the first one,the time constant of the new RC circuit will be

Correct Answer
verified

A kilowatt-hour is equivalent to

Correct Answer
verified

A 120-Ω laboratory resistor is rated at 0.25 W.How much current can safely flow through the resistor?

Correct Answer
verified

The figure shows conventional current passing through a resistor.The arrow shows the direction in which this conventional current is flowing.Which of the following statements are correct? (There could be more than one correct choice. )

Correct Answer
verified

A simple circuit has a total resistance of 30 Ω.If a 2.0-A current is maintained in this circuit,how much energy is dissipated in this circuit in 4.0 seconds?

Correct Answer
verified

Exam 21: Electric Current and Direct-Current Circuits

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 Ω ∙ m?

Correct AnswerverifiedShow Answer

The resistivity of the material of a wire is 1.76 × 10-8 Ω ∙ m.If the diameter of the wire is 2.00 mm and its length is 2.00 m,what is its resistance?

Correct AnswerverifiedShow Answer

Consider two copper wires with circular cross-sections and equal lengths.One wire has 3 times the diameter of the other.How do the resistances of these two wires compare?

Correct AnswerverifiedShow Answer

A 1.0-μF capacitor is charged until it acquires a potential difference of 900.0 V. Across its plates,and then the emf source is removed.If the capacitor is then discharged through a 500.0-kΩ. Resistance,what is the voltage drop across the capacitor 9.0 ms. After beginning the discharge?

Correct AnswerverifiedShow Answer

What is the potential drop from point A to point B for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

Correct AnswerverifiedShow Answer

When 5.00 A is flowing through an 10.0-Ω device,how much power is being dissipated in the device?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Three capacitors are connected as shown in the figure.What is the equivalent capacitance between points A and B?

Correct AnswerverifiedShow Answer

For the circuit shown in the figure,C = 13 µF and R = 7.6 MΩ.Initially the switch S is open with the capacitor charged to a voltage of 80 V.The switch is then closed at time t = 0.00 s.What is the charge on the capacitor 40 s after closing the switch?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In the circuit shown in the figure,R1 = 10 Ω,R2 = 12 Ω,R3 = 20 Ω,V1 = 1.0 V,V2 = 7.0 V,and the batteries are both ideal.What is the current through R1?

Correct AnswerverifiedShow Answer

What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.

Correct AnswerverifiedShow Answer

For the graph shown in the figure,what physical quantity does the slope of the graph represent for a dc circuit?

Correct AnswerverifiedShow Answer

Three resistors with resistances of 2.0 Ω,6.0 Ω,and 12 Ω are connected across an ideal dc voltage source V,as shown in the figure.If the total current in the circuit is I = 5.0 A,what is the current through the 12-Ω resistor?

Correct AnswerverifiedShow Answer

When unequal resistors are connected in series across an ideal battery,

Correct AnswerverifiedShow Answer

A capacitor C is connected in series with a resistor R across a battery and an open switch.If a second capacitor of capacitance 2C is connected in series with the first one,the time constant of the new RC circuit will be

Correct AnswerverifiedShow Answer

A kilowatt-hour is equivalent to

Correct AnswerverifiedShow Answer

A 120-Ω laboratory resistor is rated at 0.25 W.How much current can safely flow through the resistor?

Correct AnswerverifiedShow Answer

The figure shows conventional current passing through a resistor.The arrow shows the direction in which this conventional current is flowing.Which of the following statements are correct? (There could be more than one correct choice. )

Correct AnswerverifiedShow Answer

A simple circuit has a total resistance of 30 Ω.If a 2.0-A current is maintained in this circuit,how much energy is dissipated in this circuit in 4.0 seconds?

Correct AnswerverifiedShow Answer

What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10^-8 Ω ∙ m?

Correct Answer
verified

The resistivity of the material of a wire is 1.76 × 10^-8 Ω ∙ m.If the diameter of the wire is 2.00 mm and its length is 2.00 m,what is its resistance?

Correct Answer
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In the circuit shown in the figure,R₁ = 10 Ω,R₂ = 12 Ω,R₃ = 20 Ω,V₁ = 1.0 V,V₂ = 7.0 V,and the batteries are both ideal.What is the current through R₁?

Correct Answer
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