Question 1

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

Accepted Answer

A) attract. 
B) repel or attract. 
C) obey the inverse-square law. 
D) act over shorter distances. 
E) are weaker. 
A) attract. 
B) repel or attract. 
C) obey the inverse-square law. 
D) act over shorter distances. 
E) are weaker.

Question 2

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

Accepted Answer

A) may occur in an infinite variety of quantities. 
B) is a whole-number multiple of the charge of one electron. 
C) will interact with neighboring electric charges. 
D) can be neither created nor destroyed. 
E) is sometimes positive. 
A) may occur in an infinite variety of quantities. 
B) is a whole-number multiple of the charge of one electron. 
C) will interact with neighboring electric charges. 
D) can be neither created nor destroyed. 
E) is sometimes positive.

Question 3

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

Accepted Answer

A) electrons that surround the nucleus. 
B) neutrons in the nucleus. 
C) Choices A and B are both correct. 
D) Choices A and B are both incorrect. 
A) electrons that surround the nucleus. 
B) neutrons in the nucleus. 
C) Choices A and B are both correct. 
D) Choices A and B are both incorrect.

Question 4

The primary purpose of a lightning rod is to

Accepted Answer

A) attract lightning and guide it to the ground. 
B) discharge the structure to which it is attached. 
C) cancel the electric field within the structure to which it is attached. 
D) induce a charge opposite to that of charged clouds overhead. 
A) attract lightning and guide it to the ground. 
B) discharge the structure to which it is attached. 
C) cancel the electric field within the structure to which it is attached. 
D) induce a charge opposite to that of charged clouds overhead.

Question 5

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

Accepted Answer

A) less than 10 V. 
B) 10 V. 
C) more then 10 V. 
D) None of the above choices are correct. 
A) less than 10 V. 
B) 10 V. 
C) more then 10 V. 
D) None of the above choices are correct.

Question 6

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

Accepted Answer

A) F) 
B) 2 F. 
C) F/2. 
D) F/4. 
E) none of these 
A) F) 
B) 2 F. 
C) F/2. 
D) F/4. 
E) none of these

Question 7

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

Accepted Answer

A) energy. 
B) electric field. 
C) polarization. 
D) conduction. 
A) energy. 
B) electric field. 
C) polarization. 
D) conduction.

Question 8

The fundamental force underlying all chemical reactions is

Accepted Answer

A) gravitational. 
B) nuclear. 
C) centripetal. 
D) electrical. 
E) None of the above choices are correct. 
A) gravitational. 
B) nuclear. 
C) centripetal. 
D) electrical. 
E) None of the above choices are correct.

Question 9

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

Accepted Answer

A) quadruples. 
B) doubles. 
C) halves. 
D) is reduced by 1/4. 
E) None of the above choices are correct. 
A) quadruples. 
B) doubles. 
C) halves. 
D) is reduced by 1/4. 
E) None of the above choices are correct.

Question 10

The electrical force between charges is strongest when the charges are

Accepted Answer

A) close together. 
B) far apart. 
C) The electric force is constant everywhere. 
A) close together. 
B) far apart. 
C) The electric force is constant everywhere.

Question 11

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

Accepted Answer

A) increases. 
B) decreases. 
C) stays the same. 
A) increases. 
B) decreases. 
C) stays the same.

Question 12

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

Accepted Answer

A) 0)25 V. 
B) 0)5 V. 
C) 1 V. 
D) 2 V. 
E) 4 V. 
A) 0)25 V. 
B) 0)5 V. 
C) 1 V. 
D) 2 V. 
E) 4 V.

Question 13

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

Accepted Answer

A) fall closer together. 
B) spread apart further. 
C) do not move. 
A) fall closer together. 
B) spread apart further. 
C) do not move.

Question 14

Strip electrons from an atom and the atom becomes a

Accepted Answer

A) positive ion. 
B) negative ion. 
C) different element. 
D) molecule. 
A) positive ion. 
B) negative ion. 
C) different element. 
D) molecule.

Question 15

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

Accepted Answer

A) total charge on an object has changed. 
B) net amount of negative charges on an object is unbalanced by positive charge on another object. 
C) total amount of charge on an object has increased. 
D) net charge has been created or destroyed. 
E) None of the above choices are correct. 
A) total charge on an object has changed. 
B) net amount of negative charges on an object is unbalanced by positive charge on another object. 
C) total amount of charge on an object has increased. 
D) net charge has been created or destroyed. 
E) None of the above choices are correct.

Question 16

Which force binds atoms together to form molecules?

Accepted Answer

A) gravitational 
B) nuclear 
C) electrical 
D) centripetal 
E) none of these 
A) gravitational 
B) nuclear 
C) electrical 
D) centripetal 
E) none of these

Question 17

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

Accepted Answer

A) positively charged. 
B) negatively charged. 
C) uncharged. 
A) positively charged. 
B) negatively charged. 
C) uncharged.

Question 18

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

Accepted Answer

A) the same sign. 
B) opposite signs. 
C) the same mass. 
D) the same size. 
E) impossible to answer without additional information 
A) the same sign. 
B) opposite signs. 
C) the same mass. 
D) the same size. 
E) impossible to answer without additional information

Question 19

A positive ion has more

Accepted Answer

A) electrons than neutrons. 
B) electrons than protons. 
C) protons than electrons. 
D) protons than neutrons. 
E) neutrons than protons. 
A) electrons than neutrons. 
B) electrons than protons. 
C) protons than electrons. 
D) protons than neutrons. 
E) neutrons than protons.

Question 20

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

Accepted Answer

A) half as much. 
B) the same. 
C) twice as much. 
D) four times as much. 
E) None of the above choices are correct. 
A) half as much. 
B) the same. 
C) twice as much. 
D) four times as much. 
E) None of the above choices are correct.

Exam 22: Electrostatics

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

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

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

The primary purpose of a lightning rod is to

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

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

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

The fundamental force underlying all chemical reactions is

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

The electrical force between charges is strongest when the charges are

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

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

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

Strip electrons from an atom and the atom becomes a

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

Which force binds atoms together to form molecules?

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

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

A positive ion has more

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

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