Question 1

In the figure,when the terminal voltage Vab of the battery is equal to 20 V,how much current passes through the battery,including its direction?

Accepted Answer

A)  4 A, from a to b 
B)  5 A, from a to b 
C)  6 A, from a to b 
D)  4 A, from b to a 
E)  5 A, from b to a 
A)  4 A, from a to b 
B)  5 A, from a to b 
C)  6 A, from a to b 
D)  4 A, from b to a 
E)  5 A, from b to a

Question 2

For the circuit shown in the figure,what is the current through resistor R3?

Accepted Answer

A)  0.043 A 
B)  1.5 A 
C)  0.028 A 
D)  0.086 A 
A)  0.043 A 
B)  1.5 A 
C)  0.028 A 
D)  0.086 A

Question 3

If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm,what is the average current density in this wire?

Accepted Answer

A)  7.6 × 105 A/m2 
B)  5.2 × 10-6 A/m2 
C)  1.9 × 105 A/m2 
D)  3.6 × 105 A/m2 
E)  21 × 10-6 A/m2 
A)  7.6 × 105 A/m2 
B)  5.2 × 10-6 A/m2 
C)  1.9 × 105 A/m2 
D)  3.6 × 105 A/m2 
E)  21 × 10-6 A/m2

Question 4

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.Compared to the polarity shown in the figure,the emf ε1 is closest to

Accepted Answer

A)  -5 V. 
B)  5 V. 
C)  45 V. 
D)  51 V. 
E)  -51 V. 
A)  -5 V. 
B)  5 V. 
C)  45 V. 
D)  51 V. 
E)  -51 V.

Question 5

A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?

Accepted Answer

A)  90 mA 
B)  1.0 A 
C)  5.0 A 
D)  11 A 
E)  14 A 
A)  90 mA 
B)  1.0 A 
C)  5.0 A 
D)  11 A 
E)  14 A

Question 6

The figure shows a 2.0-cm diameter roller that turns at 90 rpm.A 4.0-cm wide plastic film is being wrapped onto the roller,and this plastic carries an excess electric charge having a uniform surface charge density of 5.0 nC/cm2.What is the current of the moving film?

Accepted Answer

A)  190 nA 
B)  23 μA 
C)  30 nA 
D)  11 μA 
A)  190 nA 
B)  23 μA 
C)  30 nA 
D)  11 μA

Question 7

A light bulb is connected to a 110-V source.What is the resistance of this bulb if it is a 100-W bulb?

Accepted Answer

A)  100 Ω 
B)  8.0 mΩ 
C)  6.0 mΩ 
D)  120 Ω 
E)  240 Ω 
A)  100 Ω 
B)  8.0 mΩ 
C)  6.0 mΩ 
D)  120 Ω 
E)  240 Ω

Question 8

A certain fuse "blows" if the current in it exceeds 1.0 A,at which instant the fuse melts with a current density of 620 A/cm2. What is the diameter of the wire in the fuse?

Accepted Answer

A)  0.45 mm 
B)  0.63 mm 
C)  0.68 mm 
D)  0.91 mm 
A)  0.45 mm 
B)  0.63 mm 
C)  0.68 mm 
D)  0.91 mm

Question 9

The figure shows a steady electric current passing through a wire with a narrow region.What happens to the drift velocity of the moving charges as they go from region A to region B and then to region C?

Accepted Answer

A)  The drift velocity decreases from A to B and increases from B to C. 
B)  The drift velocity increases all the time. 
C)  The drift velocity remains constant. 
D)  The drift velocity decreases all the time. 
E)  The drift velocity increases from A to B and decreases from B to C. 
A)  The drift velocity decreases from A to B and increases from B to C. 
B)  The drift velocity increases all the time. 
C)  The drift velocity remains constant. 
D)  The drift velocity decreases all the time. 
E)  The drift velocity increases from A to B and decreases from B to C.

Question 10

Two unknown resistors are connected together.When they are connected in series their equivalent resistance is 15 Ω.When they are connected in parallel,their equivalent resistance is 3.3 Ω.What are the resistances of these resistors?

Accepted Answer

The answer of Two unknown resistors are connected together.When they...

Question 11

The emf and the internal resistance of a battery are shown in the figure.If a current of 7.8 A is established through the battery from b to a,what is the terminal voltage Vab of the battery?

Accepted Answer

A)  -30 V 
B)  80 V 
C)  30 V 
D)  -80 V 
E)  zero 
A)  -30 V 
B)  80 V 
C)  30 V 
D)  -80 V 
E)  zero

Question 12

Three resistors having resistances of 4.0 Ω,6.0 Ω,and 10.0 Ω are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a 2.0-Ω resistor,what is the current through the 10.0-Ω resistor?

Accepted Answer

A)  0.59 A 
B)  2.7 A 
C)  6.4 A 
D)  11.2 A 
E)  16 A 
A)  0.59 A 
B)  2.7 A 
C)  6.4 A 
D)  11.2 A 
E)  16 A

Question 13

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

When electric current is flowing in a metal,the electrons are moving

Accepted Answer

A)  at nearly the speed of light. 
B)  at the speed of light. 
C)  at the speed of sound in the metal. 
D)  at the speed of sound in air. 
E)  at none of the above speeds. 
A)  at nearly the speed of light. 
B)  at the speed of light. 
C)  at the speed of sound in the metal. 
D)  at the speed of sound in air. 
E)  at none of the above speeds.

Question 15

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

Accepted Answer

A)  increases. 
B)  decreases. 
C)  does not change. 
A)  increases. 
B)  decreases. 
C)  does not change.

Question 16

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 8.00-

Question 17

For the circuit shown in the figure,determine the current in
(a)the 1.0-Ω resistor.
(b)the 3.0-Ω resistor.
(c)the 4.0-Ω resistor.

Accepted Answer

(a)2.8 A

Question 18

The figure shows two connected wires that are made of the same material.The current entering the wire on the left is 2.0 A and in that wire the electron drift speed is vd.What is the electron drift speed in the wire on the right side?

Accepted Answer

A)  4vd 
B)  2vd 
C)  vd 
D)  vd/2 
E)  vd/4 
A)  4vd 
B)  2vd 
C)  vd 
D)  vd/2 
E)  vd/4

Question 19

A gold wire that is 1.8 mm in diameter and 15 cm long carries a current of 260 mA.How many electrons per second pass a given cross section of the wire? (e = 1.60 × 10-19C)

Accepted Answer

A)  1.6 × 1018 
B)  1.6 × 1017 
C)  1.5 × 1023 
D)  3.7 × 1015 
A)  1.6 × 1018 
B)  1.6 × 1017 
C)  1.5 × 1023 
D)  3.7 × 1015

Question 20

For the circuit shown in the figure,all quantities are accurate to 2 significant figures.What is the value of the current I1?

Accepted Answer

A)  0.32 A 
B)  0.11 A 
C)  0.29 A 
D)  0.61 A 
E)  0.89 A 
A)  0.32 A 
B)  0.11 A 
C)  0.29 A 
D)  0.61 A 
E)  0.89 A

Exam 31: Electric Circuits

In the figure,when the terminal voltage Vab of the battery is equal to 20 V,how much current passes through the battery,including its direction?

For the circuit shown in the figure,what is the current through resistor R3?

If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm,what is the average current density in this wire?

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.Compared to the polarity shown in the figure,the emf ε1 is closest to

A 110-V hair dryer is rated at 1200 W. What current will it draw when operating from a 110-V electrical outlet?

The figure shows a 2.0-cm diameter roller that turns at 90 rpm.A 4.0-cm wide plastic film is being wrapped onto the roller,and this plastic carries an excess electric charge having a uniform surface charge density of 5.0 nC/cm2.What is the current of the moving film?

A light bulb is connected to a 110-V source.What is the resistance of this bulb if it is a 100-W bulb?

A certain fuse "blows" if the current in it exceeds 1.0 A,at which instant the fuse melts with a current density of 620 A/cm2. What is the diameter of the wire in the fuse?

The figure shows a steady electric current passing through a wire with a narrow region.What happens to the drift velocity of the moving charges as they go from region A to region B and then to region C?

Two unknown resistors are connected together.When they are connected in series their equivalent resistance is 15 Ω.When they are connected in parallel,their equivalent resistance is 3.3 Ω.What are the resistances of these resistors?

The emf and the internal resistance of a battery are shown in the figure.If a current of 7.8 A is established through the battery from b to a,what is the terminal voltage Vab of the battery?

Three resistors having resistances of 4.0 Ω,6.0 Ω,and 10.0 Ω are connected in parallel. If the combination is connected in series with an ideal 12-V battery and a 2.0-Ω resistor,what is the current through the 10.0-Ω resistor?

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.The current I2 is closest to

When electric current is flowing in a metal,the electrons are moving

As more resistors are added in parallel across a constant voltage source,the power supplied by the source

For the circuit shown in the figure,determine the current in (a)the 1.0-Ω resistor. (b)the 3.0-Ω resistor. (c)the 4.0-Ω resistor.

The figure shows two connected wires that are made of the same material.The current entering the wire on the left is 2.0 A and in that wire the electron drift speed is vd.What is the electron drift speed in the wire on the right side?

A gold wire that is 1.8 mm in diameter and 15 cm long carries a current of 260 mA.How many electrons per second pass a given cross section of the wire? (e = 1.60 × 10-19C)

For the circuit shown in the figure,all quantities are accurate to 2 significant figures.What is the value of the current I1?

Foundations

A: Foundations

Motion in One Dimension

Acceleration

Momentum

Energy

Principle of Relativity

Interactions

Force

Work

Motion in a Plane

Motion in a Circle

Torque

Gravity

Special Relativity

Periodic Motion

Waves in One Dimension

Waves in Two and Three Dimensions

Fluids

Entropy

Energy Transferred Thermally

Degradation of Energy

Electric Interactions

The Electric Field

Gausss Law

Work and Energy in Electrostatics

Charge Separation and Storage

Magnetic Interactions

Magnetic Fields of Charged Particles in Motion

Changing Magnetic Fields

Changing Electric Fields

Electronics

Ray Optics

Wave and Particle Optics

Filters

In the figure,when the terminal voltage V_ab of the battery is equal to 20 V,how much current passes through the battery,including its direction?

For the circuit shown in the figure,what is the current through resistor R₃?

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.Compared to the polarity shown in the figure,the emf ε₁is closest to

The figure shows a 2.0-cm diameter roller that turns at 90 rpm.A 4.0-cm wide plastic film is being wrapped onto the roller,and this plastic carries an excess electric charge having a uniform surface charge density of 5.0 nC/cm².What is the current of the moving film?

A certain fuse "blows" if the current in it exceeds 1.0 A,at which instant the fuse melts with a current density of 620 A/cm². What is the diameter of the wire in the fuse?

The emf and the internal resistance of a battery are shown in the figure.If a current of 7.8 A is established through the battery from b to a,what is the terminal voltage V_ab of the battery?

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.The current I₂ is closest to

The figure shows two connected wires that are made of the same material.The current entering the wire on the left is 2.0 A and in that wire the electron drift speed is v_d.What is the electron drift speed in the wire on the right side?

A gold wire that is 1.8 mm in diameter and 15 cm long carries a current of 260 mA.How many electrons per second pass a given cross section of the wire? (e = 1.60 × 10^-19C)

For the circuit shown in the figure,all quantities are accurate to 2 significant figures.What is the value of the current I₁?