Question 1

When the current through a resistor is increased by a factor of 4,the power dissipated by the resistor

Accepted Answer

A) decreases by a factor of 4. 
B) decreases by a factor of 16. 
C) increases by a factor of 16. 
D) increases by a factor of 4. 
E) increases by a factor of 2. 
A) decreases by a factor of 4. 
B) decreases by a factor of 16. 
C) increases by a factor of 16. 
D) increases by a factor of 4. 
E) increases by a factor of 2.

Question 2

A device with a resistance of $200.0 \mathrm { k } \Omega$ is connected to a $10.0 - \mathrm { V }$ battery.How much power does the device use?

Accepted Answer

A) 0.50 mW 
B) 20,000 kW 
C) 0.050 mW 
D) 2000 kW 
A) 0.50 mW 
B) 20,000 kW 
C) 0.050 mW 
D) 2000 kW

Question 3

A tube of mercury with resistivity 9.84 × 10-7 Ω ∙ m has a uniform electric field of 23 N/C inside the mercury.What is the current through the tube,if the radius of the tube is 0.495 mm?

Accepted Answer

A) 18 A 
B) 180 A 
C) 29 A 
D) 280 A 
A) 18 A 
B) 180 A 
C) 29 A 
D) 280 A

Question 4

What is the current through the battery in 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 A 
B) 2.0 A 
C) 2.5 A 
D) 3.0 A 
A) 0.35 A 
B) 2.0 A 
C) 2.5 A 
D) 3.0 A

Question 5

A15-Ω resistor is connected in parallel with a 30-Ω resistor.If this combination is now connected in series with an ideal 9.0-V battery and a 20-Ω resistor,what is the current through the 15-Ω resistor?

Accepted Answer

A) 0.10 A 
B) 0.13 A 
C) 0.20 A 
D) 0.26 A 
A) 0.10 A 
B) 0.13 A 
C) 0.20 A 
D) 0.26 A

Question 6

What is the magnitude of the potential difference between points B and C for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

Accepted Answer

A) 6.0 V 
B) 4.0 V 
C) 3.0 V 
D) 2.0 V 
A) 6.0 V 
B) 4.0 V 
C) 3.0 V 
D) 2.0 V

Question 7

The graph shown in the figure shows the results of measurements of the dc current through a circuit device for various potential differences across it.Assume that all the numbers shown are accurate to two significant figures.What is the resistance of this device?

Accepted Answer

The answer of The graph shown in the figure shows...

Question 8

If the length and diameter of a wire of circular cross section are both tripled,the resistance will be

Accepted Answer

A) unchanged. 
B) tripled. 
C) increased by a factor of 9. 
D) 1/3 of what it originally was. 
E) 1/9 of what it originally was. 
A) unchanged. 
B) tripled. 
C) increased by a factor of 9. 
D) 1/3 of what it originally was. 
E) 1/9 of what it originally was.

Question 9

A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm.What is the voltage across its length when there is a 4000-A current through it? The resistivity of the metal is 1.68 × 10-8 Ω ∙ m.

Accepted Answer

A) 0.67 V 
B) 0.34 V 
C) 0.067 V 
D) 0.034 V 
A) 0.67 V 
B) 0.34 V 
C) 0.067 V 
D) 0.034 V

Question 10

The length of a certain wire is doubled while its radius is kept constant.What is the new resistance of this wire?

Accepted Answer

A) It stays the same. 
B) It is 2 times as large. 
C) It is 3 times as large. 
D) It is 4 times as large. 
E) It is ½ as large. 
A) It stays the same. 
B) It is 2 times as large. 
C) It is 3 times as large. 
D) It is 4 times as large. 
E) It is ½ as large.

Question 11

When a potential difference is applied across a piece of wire made of metal A,there is a $5.0 - m A$ current through it.If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire,how much current will be through the metal-B wire? The lengths of both wires are the same,and the voltage across their ends remains unchanged.The resistivity of metal A is 1.68 × 10-8 Ω ∙ m,and the resistivity of metal B is 1.59 × 10-8 Ω ∙ m.

Accepted Answer

A) 21 mA 
B) 19 mA 
C) 11 mA 
D) 5.3 mA 
A) 21 mA 
B) 19 mA 
C) 11 mA 
D) 5.3 mA

Question 12

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) capacitance 
A) resistivity 
B) resistance 
C) energy 
D) current 
E) capacitance

Question 13

In an electroplating process,it is desired to deposit 40 mg of silver on a metal part by using a current of 2.0 A.How long must the current be allowed to run to deposit this much silver? The silver ions are singly charged,and the atomic mass of silver is 108 g/mol.(e = 1.60 × 10-19 C,NA = 6.02 × 1023 atoms/mol)

Accepted Answer

A) 16 s 
B) 18 s 
C) 20 s 
D) 22 s 
A) 16 s 
B) 18 s 
C) 20 s 
D) 22 s

Question 14

In the circuit shown in the figure,R1 = 60 Ω,R2 = 120 Ω,R3 = 180 Ω,V1 = 3.0 V,V2 = 6.0 V,and the batteries are both ideal.What is the current through R1?

Accepted Answer

A) 0.050 A 
B) 0.030 A 
C) 0.00 A 
D) 2.68 A 
A) 0.050 A 
B) 0.030 A 
C) 0.00 A 
D) 2.68 A

Question 15

If a quantity you calculated has units of A ∙ s,what is that quantity?

Accepted Answer

A) potential 
B) resistivity 
C) resistance 
D) capacitance 
E) charge 
A) potential 
B) resistivity 
C) resistance 
D) capacitance 
E) charge

Question 16

In the circuit shown in the figure,the resistor R has a variable resistance.As R is decreased,what happens to the currents?

Accepted Answer

A) I1 remains unchanged and I2 increases. 
B) I1 decreases and I2 decreases. 
C) I1 decreases and I2 increases. 
D) I1 increases and I2 decreases. 
E) I1 increases and I2 increases. 
A) I1 remains unchanged and I2 increases. 
B) I1 decreases and I2 decreases. 
C) I1 decreases and I2 increases. 
D) I1 increases and I2 decreases. 
E) I1 increases and I2 increases.

Question 17

A 200-Ω resistor is rated at 1/4 W.What is the maximum current it can safely draw?

Accepted Answer

A) 0.035 A 
B) 0.35 A 
C) 50 A 
D) 0.25 A 
A) 0.035 A 
B) 0.35 A 
C) 50 A 
D) 0.25 A

Question 18

If a quantity you calculated has units of $\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 2 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } }$ what is that quantity?

Accepted Answer

A) potential 
B) resistivity 
C) resistance 
D) capacitance 
E) current 
A) potential 
B) resistivity 
C) resistance 
D) capacitance 
E) current

Question 19

Two resistors with resistances of 5.0 Ω and 9.0 Ω 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.What is the current through (a)the 4.0-Ω resistor and (b)the 5.0-Ω resistor?

Accepted Answer

(a)0.83 A

Question 20

The length of a certain wire is doubled and at the same time its radius is also doubled.What is the new resistance of this wire?

Accepted Answer

A) It stays the same. 
B) It is 2 times as large. 
C) It is 4 times as large. 
D) It is ½ as large. 
E) It is ¼ as large. 
A) It stays the same. 
B) It is 2 times as large. 
C) It is 4 times as large. 
D) It is ½ as large. 
E) It is ¼ as large.

Exam 17: Dc Circuits

When the current through a resistor is increased by a factor of 4,the power dissipated by the resistor

A device with a resistance of 200.0kΩ200.0 \mathrm { k } \Omega200.0kΩ is connected to a 10.0−V10.0 - \mathrm { V }10.0−V battery.How much power does the device use?

A tube of mercury with resistivity 9.84 × 10-7 Ω ∙ m has a uniform electric field of 23 N/C inside the mercury.What is the current through the tube,if the radius of the tube is 0.495 mm?

What is the current through the battery in the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

A15-Ω resistor is connected in parallel with a 30-Ω resistor.If this combination is now connected in series with an ideal 9.0-V battery and a 20-Ω resistor,what is the current through the 15-Ω resistor?

What is the magnitude of the potential difference between points B and C for the circuit shown in the figure? The battery is ideal,and all the numbers are accurate to two significant figures.

The graph shown in the figure shows the results of measurements of the dc current through a circuit device for various potential differences across it.Assume that all the numbers shown are accurate to two significant figures.What is the resistance of this device?

If the length and diameter of a wire of circular cross section are both tripled,the resistance will be

A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm.What is the voltage across its length when there is a 4000-A current through it? The resistivity of the metal is 1.68 × 10-8 Ω ∙ m.

The length of a certain wire is doubled while its radius is kept constant.What is the new resistance of this wire?

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

In the circuit shown in the figure,R1 = 60 Ω,R2 = 120 Ω,R3 = 180 Ω,V1 = 3.0 V,V2 = 6.0 V,and the batteries are both ideal.What is the current through R1?

If a quantity you calculated has units of A ∙ s,what is that quantity?

In the circuit shown in the figure,the resistor R has a variable resistance.As R is decreased,what happens to the currents?

A 200-Ω resistor is rated at 1/4 W.What is the maximum current it can safely draw?

If a quantity you calculated has units of kg⋅m2 s⋅C2\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 2 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } } s⋅C2kg⋅m2​ what is that quantity?

The length of a certain wire is doubled and at the same time its radius is also doubled.What is the new resistance of this wire?

Introduction

Kinematics: Motion in One Dimension

Newtonian Mechanics

Applying Newtons Laws

Circular Motion

Impulse and Linear Momentum

Work and Energy

Extended Bodies at Rest

Rotational Motion

Gases

Static Fluids

Fluids in Motion

First Law of Thermodynamics

Second Law of Thermodynamics

Electric Charge force and Energy

The Electric Field

Magnetism

Electromagnetic Induction

Vibrational Motion

Mechanical Waves

Reflection and Refraction

Mirrors and Lenses

Wave Optics

Electromagnetic Waves

Special Relativity

Quantum Optics

Atomic Physics

Nuclear Physics

Particle Physics

Filters

A device with a resistance of $200.0 \mathrm { k } \Omega$ is connected to a $10.0 - \mathrm { V }$ battery.How much power does the device use?

A tube of mercury with resistivity 9.84 × 10^-7 Ω ∙ m has a uniform electric field of 23 N/C inside the mercury.What is the current through the tube,if the radius of the tube is 0.495 mm?

A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm.What is the voltage across its length when there is a 4000-A current through it? The resistivity of the metal is 1.68 × 10^-8 Ω ∙ m.

In the circuit shown in the figure,R₁ = 60 Ω,R₂ = 120 Ω,R₃ = 180 Ω,V₁ = 3.0 V,V₂ = 6.0 V,and the batteries are both ideal.What is the current through R₁?

If a quantity you calculated has units of $\frac { \mathrm { kg } \cdot \mathrm { m } ^ { 2 } } { \mathrm {~s} \cdot \mathrm { C } ^ { 2 } }$ what is that quantity?