Question 1

Distinguish between ac and dc.When you plug a light bulb into a wall outlet,where is the source of electrons?

Accepted Answer

AC is alternating current,where electron

Question 2

The electric field in the wires of an ac circuit

Accepted Answer

A) changes via the inverse square law. 
B) changes direction with time. 
C) remains relatively constant. 
D) is nonexistent. 
E) none of the above 
A) changes via the inverse square law. 
B) changes direction with time. 
C) remains relatively constant. 
D) is nonexistent. 
E) none of the above

Question 3

It takes 10 J of work to push a charge initially at rest into an electric field.If the charge is then released,it flies back to its initial position with a kinetic energy of

Accepted Answer

A) zero. 
B) 5 J. 
C) 10 J. 
D) more than 10 J. 
E) need more information. 
A) zero. 
B) 5 J. 
C) 10 J. 
D) more than 10 J. 
E) need more information.

Question 4

The electric field around an isolated electron has a certain strength at a 1-cm distance from the electron.The electric field strength 2 cm from the electron is

Accepted Answer

A) half as much. 
B) the same. 
C) twice as much. 
D) four times as much. 
E) none of the above 
A) half as much. 
B) the same. 
C) twice as much. 
D) four times as much. 
E) none of the above

Question 5

Electrical resistance is normally measured in

Accepted Answer

A) amperes. 
B) volts. 
C) newtons. 
D) joules. 
E) none of the above 
A) amperes. 
B) volts. 
C) newtons. 
D) joules. 
E) none of the above

Question 6

The flow of charge in a circuit depends on

Accepted Answer

A) adequate resistance. 
B) a potential difference. 
C) adequate chemical action. 
D) all of the above 
A) adequate resistance. 
B) a potential difference. 
C) adequate chemical action. 
D) all of the above

Question 7

When the distance between two charges is halved,the electric force between the charges

Accepted Answer

A) quadruples. 
B) doubles. 
C) is half. 
D) is reduced by one-quarter. 
E) none of the above 
A) quadruples. 
B) doubles. 
C) is half. 
D) is reduced by one-quarter. 
E) none of the above

Question 8

A power line with a resistance of 2 ohms draws a current of 80 A.The power dissipated in the line is

Accepted Answer

A) 40 W. 
B) 160 W. 
C) 320 W. 
D) 12,800 W. 
E) none of the above 
A) 40 W. 
B) 160 W. 
C) 320 W. 
D) 12,800 W. 
E) none of the above

Question 9

To say that electric charge is conserved means that no case has ever been found where

Accepted Answer

A) the net charge on an object has changed. 
B) the net amount of charge on an object has increased. 
C) net charge has been created or destroyed. 
D) none of the above 
A) the net charge on an object has changed. 
B) the net amount of charge on an object has increased. 
C) net charge has been created or destroyed. 
D) none of the above

Question 10

The photo on page 193 shows Lillian's hair standing out when her hand is on a charged Van de Graaff generator,which illustrates

Accepted Answer

A) strands of hair become charged and repel one another. 
B) a high voltage is communicated to strands of hair. 
C) strands of hair orient themselves in an electric field. 
D) the effect of electrons and protons deposited on her hair. 
A) strands of hair become charged and repel one another. 
B) a high voltage is communicated to strands of hair. 
C) strands of hair orient themselves in an electric field. 
D) the effect of electrons and protons deposited on her hair.

Question 11

An electrical device that is "grounded" has

Accepted Answer

A) no potential difference between it and the ground. 
B) an infinite potential difference between it and the ground. 
C) a firm connection to the ground. 
D) low voltage. 
A) no potential difference between it and the ground. 
B) an infinite potential difference between it and the ground. 
C) a firm connection to the ground. 
D) low voltage.

Question 12

The different outcomes in touching a faulty 120-V light fixture and a high-voltage Van de Graaff generator have to do with differences in

Accepted Answer

A) sustainability of charge flow. 
B) duration of charge flow. 
C) amount of energy transferred. 
D) all of the above 
E) none of the above 
A) sustainability of charge flow. 
B) duration of charge flow. 
C) amount of energy transferred. 
D) all of the above 
E) none of the above

Question 13

Three 10-ohm resistors take the shape of a triangle,one resistor in each leg.An ohm-meter across any two points of the triangle will show the equivalent resistance to be

Accepted Answer

A) 1.4 ohms. 
B) 5 ohms. 
C) 6.7 ohms. 
D) greater than 6.7 ohms. 
A) 1.4 ohms. 
B) 5 ohms. 
C) 6.7 ohms. 
D) greater than 6.7 ohms.

Question 14

A pair of 1-ohm resistors connected in series has a combined resistance of

Accepted Answer

A) 1 ohm. 
B) 2 ohms. 
C) 1/2 ohm. 
D) none of the above 
A) 1 ohm. 
B) 2 ohms. 
C) 1/2 ohm. 
D) none of the above

Question 15

A bird can sit harmlessly on a high-voltage wire because

Accepted Answer

A) the wire is insulated. 
B) no potential difference is across the birds feet. 
C) current is inside,not outside,the wire. 
D) the net charge on a current-carrying wire is zero. 
E) all of the above 
A) the wire is insulated. 
B) no potential difference is across the birds feet. 
C) current is inside,not outside,the wire. 
D) the net charge on a current-carrying wire is zero. 
E) all of the above

Question 16

Which force binds atoms together to form molecules?

Accepted Answer

A) gravitational 
B) nuclear 
C) electric 
D) centripetal 
E) none of the above 
A) gravitational 
B) nuclear 
C) electric 
D) centripetal 
E) none of the above

Question 17

Electrons flow in a wire when there is

Accepted Answer

A) an imbalance of charges in the wire. 
B) a potential difference across its ends. 
C) a difference in potential energy across its ends. 
D) none of the above 
A) an imbalance of charges in the wire. 
B) a potential difference across its ends. 
C) a difference in potential energy across its ends. 
D) none of the above

Question 18

Two charged particles near each other are released.As they move,the force on each particle increases.Therefore,the particles have

Accepted Answer

A) the same sign. 
B) the opposite sign. 
C) not enough information 
A) the same sign. 
B) the opposite sign. 
C) not enough information

Question 19

When you purchase a water pipe in a hardware store,water is not included.When you purchase copper wire,electrons

Accepted Answer

A) must be supplied by you,just as water in a water pipe. 
B) already exist in the wire. 
C) may fall out,which is why wires are insulated. 
D) none of the above 
A) must be supplied by you,just as water in a water pipe. 
B) already exist in the wire. 
C) may fall out,which is why wires are insulated. 
D) none of the above

Question 20

A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with

Accepted Answer

A) 6 ohms. 
B) 6 amperes. 
C) 6 joules. 
D) 6 watts. 
E) 6 newtons. 
A) 6 ohms. 
B) 6 amperes. 
C) 6 joules. 
D) 6 watts. 
E) 6 newtons.

Exam 8: Static and Current Electricity

Distinguish between ac and dc.When you plug a light bulb into a wall outlet,where is the source of electrons?

The electric field in the wires of an ac circuit

It takes 10 J of work to push a charge initially at rest into an electric field.If the charge is then released,it flies back to its initial position with a kinetic energy of

The electric field around an isolated electron has a certain strength at a 1-cm distance from the electron.The electric field strength 2 cm from the electron is

Electrical resistance is normally measured in

The flow of charge in a circuit depends on

When the distance between two charges is halved,the electric force between the charges

A power line with a resistance of 2 ohms draws a current of 80 A.The power dissipated in the line is

To say that electric charge is conserved means that no case has ever been found where

The photo on page 193 shows Lillian's hair standing out when her hand is on a charged Van de Graaff generator,which illustrates

An electrical device that is "grounded" has

The different outcomes in touching a faulty 120-V light fixture and a high-voltage Van de Graaff generator have to do with differences in

Three 10-ohm resistors take the shape of a triangle,one resistor in each leg.An ohm-meter across any two points of the triangle will show the equivalent resistance to be

A pair of 1-ohm resistors connected in series has a combined resistance of

A bird can sit harmlessly on a high-voltage wire because

Which force binds atoms together to form molecules?

Electrons flow in a wire when there is

Two charged particles near each other are released.As they move,the force on each particle increases.Therefore,the particles have

When you purchase a water pipe in a hardware store,water is not included.When you purchase copper wire,electrons

A coulomb of charge flowing in a bulb filament powered by a 6-volt battery is provided with

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Time - Reading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: The Nature of Science

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