# Chapter 16: Electric Charge And Electric Field

76 Questions | Attempts: 711  Settings  • 1.
Is it possible for two negative charges to attract each other?
• A.

Yes, they always attract.

• B.

Yes, they will attract if they are close enough.

• C.

Yes, they will attract if one carries a larger charge than the other.

• D.

No, they will never attract.

• 2.
Is it possible for a positive and a negative charge to attract each other?
• A.

Yes, they always attract.

• B.

Yes, they will attract if they are close enough.

• C.

Yes, they will attract if one carries a larger charge than the other.

• D.

No, they will never attract.

• 3.
A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge and the silk
• A.

Acquires a positive charge also.

• B.

Acquires a negative charge.

• C.

Remains neutral.

• D.

Could either be positively charged or negatively charged. It depends on how hard the rod was rubbed.

• 4.
A proton carries a
• A.

Positive charge.

• B.

Neutral charge.

• C.

Negative charge.

• D.

Variable charge.

• 5.
The model of the atom shows a
• A.

Neutrally charged nucleus surrounded by both protons and electrons.

• B.

Nucleus consisting of both protons and neutrons, surrounded by a cloud of electrons.

• C.

Nucleus consisting of both electrons and neutrons, surrounded by a cloud of protons.

• D.

Nucleus consisting of both protons and electrons, surrounded by a cloud of neutrons.

• 6.
A neutral atom always has
• A.

More neutrons than protons.

• B.

More protons than electrons.

• C.

The same number of neutrons as protons.

• D.

The same number of protons as electrons.

• 7.
An atom has more electrons than protons. The atom is
• A.

A positive ion.

• B.

A negative ion.

• C.

A superconductor.

• D.

Impossible.

• 8.
Materials in which the electrons are bound very tightly to the nuclei are referred to as
• A.

Insulators.

• B.

Conductors.

• C.

Semiconductors.

• D.

Superconductors.

• 9.
Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as
• A.

Insulators.

• B.

Conductors.

• C.

Semiconductors.

• D.

Superconductors.

• 10.
A negatively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be charged
• A.

Positive.

• B.

Negative.

• C.

Neutral.

• D.

• 11.
Sphere A carries a net positive charge, and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. Which statement is correct?
• A.

Sphere B remains neutral.

• B.

Sphere B is now positively charged.

• C.

Sphere B is now negatively charged.

• D.

The charge on sphere B cannot be determined without additional information.

• 12.
How can a negatively charged rod charge an electroscope positively?
• A.

By conduction

• B.

By induction

• C.

By deduction

• D.

It cannot.

• 13.
An originally neutral electroscope is briefly touched with a positively charged glass rod. The electroscope
• A.

Remains neutral.

• B.

Becomes negatively charged.

• C.

Becomes positively charged.

• D.

Could become either positively or negatively charged, depending on the time of contact.

• 14.
An originally neutral electroscope is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, the electroscope
• A.

Remains neutral.

• B.

Is negatively charged.

• C.

Is positively charged.

• D.

Could be either positively or negatively charged, depending on how long the contact with ground lasted.

• 15.
A positive object touches a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves?
• A.

They separate further.

• B.

They move closer together.

• C.

They are unaffected.

• D.

Cannot be determined without further information

• 16.
A large negatively charged object is placed on an insulated table. A neutral metallic ball rolls straight toward the object, but stops before it touches it. A second neutral metallic ball rolls along the path followed by the first ball, strikes the first ball, and stops. The first ball rolls forward, but does not touch the negative object. At no time does either ball touch the negative object. What is the final charge on each ball?
• A.

The first ball is positive, and the second ball is negative.

• B.

The first ball is negative, and the second ball is positive.

• C.

Both balls remain neutral.

• D.

Both balls are positive.

• 17.
Charge is
• A.

Quantized.

• B.

Conserved.

• C.

Invariant.

• D.

• 18.
What are the units of the Coulomb constant k, which appears in Coulomb's law?
• A.

N*m/C

• B.

N/C

• C.

N^2*m/C^2

• D.

N*m^2/C^2

• 19.
Two charged objects are separated by a distance d. The first charge is larger in magnitude than the second charge.
• A.

The first charge exerts a larger force on the second charge.

• B.

The second charge exerts a larger force on the first charge.

• C.

The charges exert forces on each other equal in magnitude and opposite in direction.

• D.

The charges exert forces on each other equal in magnitude and pointing in the same direction.

• 20.
Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them?
• A.

There is no force between them since one is neutral.

• B.

There is a force of repulsion between them.

• C.

There is a force of attraction between them.

• D.

The force is attractive if A is charged positively and repulsive if A is charged

• 21.
Two charged objects attract each other with a certain force. If the charges on both objects are doubled with no change in separation, the force between them
• A.

• B.

Doubles.

• C.

Halves.

• D.

Increases, but we can't say how much without knowing the distance between them.

• 22.
Two charges are separated by a distance d and exert mutual attractive forces of F on each other. If the charges are separated by a distance of d/3, what are the new mutual forces?
• A.

F/9

• B.

F/3

• C.

3F

• D.

9F

• 23.
Two charged objects attract each other with a force F. What happens to the force between them if one charge is doubled, the other charge is tripled, and the separation distance between their centers is reduced to one-fourth its original value? The force is now equal to
• A.

16F.

• B.

24F.

• C.

(3/8)F.

• D.

96F.

• 24.
An electron and a proton are separated by a distance of 1.0 m. What happens to the magnitude of the force on the proton if a second electron is placed next to the first electron?
• A.

• B.

It doubles.

• C.

It will not change.

• D.

It goes to zero.

• 25.
An electron and a proton are separated by a distance of 1.0 m. What happens to the magnitude of the force on the first electron if a second electron is placed next to the proton?
• A.

It doubles.

• B.

It does not change.

• C.

It is reduced to half.

• D.

It becomes zero.

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