Physics Chapter 22

1. The electrical force between charges is strongest when the charges are

Close together

Far apart

The electric force is constant everywhere

2. An electron and a proton

Attract each other

Repel each other

3. If you comb your hair and the comb becomes positively charged, then your hair becomes

Positively charged

Negatively charged

Uncharged

4. If you use 10 J of work to push a coulomb of charge into an electric field, its voltage with respect to its starting position is

Less than 10 V

10 V

More then 10 V

5. Strip electrons from an atom and the atom become a

Positive ion

Negative ion

Different element

6. A main difference between gravitational and electric forces is that electrical forces

Attract

Repel or attract

Obey the inverse-square law

Act over shorter distances

Are weaker

7. Charges on the plates of a charged capacitor reside on the surfaces

Between the capacitor plates

Exterior to the capacitor

8. A difference between electric forces and gravitational forces is that electrical forces include

Separation distance

Repulsive interactions

The inverse square law

Infinite range

None of these

9. Which force binds atoms together to form molecules?

Gravitational

Nuclear

Electrical

Centripetal

None of these

10. In an electrically neutral atom the number of protons in the nucleus is equal to the number of

Electrons that surround the nucleus

Neutrons in the nucleus

Both of these

Neither of these

11. A positive ion has more

Electrons than neutrons

Electrons than protons

Protons than electrons

Protons than neutrons

Neutrons than protons

12. An electroscope is charged positively as shown by foil leaves that stand apart. as a negative charge is brought close tot he electroscope, the leaves

Fall closer together

Spread apart further

Do not move

13. Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles have

The same sign

Opposite signs

Not enough information given

14. Rub electrons from your hair with a comb and the comb becomes

Negatively charged

Positively charge

15. The electric field inside an uncharged metal ball is zero. If the ball is negatively charged, the electric field inside the ball is then

Less than zero.

Zero.

Greater than zero.

16. To say that electric charge is conserved is to say that electric charge

May occur in an infinite variety of quantities

Is a whole number multiple of the charge of one electron

Will interact with neighboring electric charges

Can be neither created nor destroyed

17. The fundamental force underlying all chemical reactions is

Gravitational

Nuclear

Centripetal

Electrical

None of these

18. The unit of electric charge, the coulomb, is the charge on

One electron

A specific large number of electrons

19. The electrical force between charges depends on the

Magnitude of electric charges

Separation distance between electric charges

Both of these

None of these

20. Two protons attract each other gravitationally and repel each other electrically. By far the greater is

The gravitational attraction

The electrical repulsion

Neither- they are the same

21. A positive charge and a negative charge held near each other are released. As they move, the force on each particle

Increases

Decreases

Stays the same

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

The total charge on an object has changed

The net amount of negative charge on an object is unbalanced by a positive charge on another object

The total amount of charge on an object has increased

Net charge has been created or destroyed

None of these

23. Every proton in the universe is surrounded by its own

Electric field

Gravitational field

Both of these

Non of these

24. If you use 10 J of work to push a charge into an electric field and then release the charge, as it flies past its starting position, its kinetic energy is

Less than 10 J

10 J

More than 10 J

25. The electrical force on a 2-C charge is 60 N. What is the value of the electric field at the place where the charge is located?

20 N/C

30 N/C

60 N/C

120 N/C

240 N/C

26. Two charged particles held near each other are released. As they move, the acceleration of each decreases. Therefore, the particles have

The same sign

Opposite signs

Not enough information given

27. A transistor is an example of

A resistor

A superconductor

A semiconductor

A dry cell

Electrostatic shielding

28. To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with

Steel

Wood

Both the same

29. You can touch a 100,000- volt Van de Graaff generator with little harm because although the voltage is high, the relatively small amount of charge means there is a relatively small amount of

Energy

Electric field

Polarization

Conduction

30. Charge carriers in a metal are electrons rather than protons because electrons are

Negative

Smaller

Loosely bound

All of these

None of these

31. When the distance between two charges is halved, the electrical force between the charges

Quadruples

Doubles

Halves

Is reduced by 1/4

None of these

32. When a car is struck by lightning, the resulting electric field inside the car is

Normally huge, but for brief time

Normally huge for a time longer than the lightning stroke itself

Small enough to be safe for an occupant inside

Zero

33. A negatively charged rod is brought near a metal can that rests on a wood table. you touch the opposite side of the can momentarily with your finger. The can is then

Positively charged

Negatively charged

Uncharged

Charged the same as it was

34. A balloon will stick to a wooden wall if the balloon is charged

Negatively

Positively

Either way

Neither way

35. To say that electric charge is quantized is to say that the charge on an object

May occur in an infinite variety of quantities

Is a whole number multiple of the charge of one electron

Will interact with neighboring electric charges

Can be neither created nor destroyed

36. Particle A and particle B interact with each other. Particle A has twice the charge of particle B. Compared to the force on Particle A, the force on Particle B is

Four times as much

Two times as much

The same

Half as much

None of these

37. A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?

Electron

Proton

Both accelerate equally

Neither accelerates

38. Electric potential, measured in volts, is the ratio of electric energy to amount of electric

Current

Resistance

Charge

Voltage

None of these

39. To say that an object is electrically polarized is to say

It is electrically charged

Its charges have been rearranged

Its internal electric field is zero

It is only partially conducting

It is to some degree magnetic

40. Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled to 3-m separation distance, the force on each charge will be

0.33 N

0.11 N

0 N

3 N

9 N

41. Two charges separated by one meter exert 1-N forces on each other. If the magnitude of each charge is doubled, the force on each charge is

1 N

2 N

4 N

8 N

None of these

42. An electron is pushed into an electric field where it acquires a 1-V electrical potential. If two electrons are pushed the same distance into the same electric field, the electrical potential of the two electrons is

0.25 V

0.5 V

1 V

2 V

4 V

43. A charged balloon neatly illustrates that something can have a great amount of

Potential energy and a low voltage

Voltage and a small potential energy

Both voltage and potential energy

None of these

44. Superconductors are noted for their

High electric resistance

Low electric resistance

Absence of electric resistance

45. Two charged particles attract each other with a force F. If the charges of both particles are dubled, and the distance between them also doubled, then the force of attraction will be

F

2 F

F/2

F/4

None of these

46. An uncharged pitch ball is suspended by a nylon fiber. When a negatively charged rubber rod is brought nearby, without touching it, the pitch ball

Becomes charged by induction

Becomes polarized

Is repelled by the rod

All of these

None of these

47. The direction of an electric field is the direction of the force that it would exert on

A neutron

An electron

An atom

A proton

A molecule

48. Two charges separated by one meter exert 1-N forces on each other if the charges are pulled to 3-m separation distance, the force on each charge will be

1 N

2 N

4 N

8 N

16 N

49. When a single charge q is placed at one corner of a square, the electric field at the center of the square is F/q. If two other equal charges are placed at the adjacent corners of the square, the electric field at the center of the square due to these three equal charges is

F/q

4F/q

F/(2q)

F(4q)

None of these

50. The primary purpose of a lightning rod is to

Attract lightning and guide it to the ground

Discharge the structure to which it is attached.

Cancel the electric field within the structure to which it is attached

Induce within the structure to which it is attached a charge opposite to that of charged clouds overhead

51. The net charge on a charged capacitor

Depends on the area of the capacitor plates

Depends on the distance between the capacitor plates

Depends on the medium between the capacitor plates

All of these

None of these- the net charge is zero

52. Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be

F

2F

F/2

F/4

None of these

53. Normally a balloon charged to several thousand volts has a relatively small amount of

Charge

Energy

Both

Neither

54. A conductor differs from an insulator in that a conductor

Has more electrons than protons

Has more protons than electrons

Has more energy than an insulator

Has faster moving molecules

None of these

55. The electric field inside the dome of a Van de Graaff generator

Depends on the amount of charge on it

Depends on its size

Both of these

Neither of these

56. Two charged particles held close to each other are released. As the particles move, the velocity of each increases. Therefore, their charges have

The same sign

Opposite signs

Not enough information given

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

Half as much

The same

Twice as much

Four times as much

None of these

58. When a single charge q is placed on one corner of a square, the electric field at the center of the square is F/q. If three other equal charges are placed on the other corners, the electric field at the center of the square due to these four equal charges is

F/q

4F/q

F/(2q)

F/(4q)

None of these