Question 1

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

Accepted Answer

A) a neutral test charge. 
B) an electron. 
C) an atom. 
D) a proton. 
E) a molecule. 
A) a neutral test charge. 
B) an electron. 
C) an atom. 
D) a proton. 
E) a molecule.

Question 2

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

Accepted Answer

A) the same sign. 
B) opposite signs. 
C) either the same or opposite signs. 
D) impossible to answer without additional information 
A) the same sign. 
B) opposite signs. 
C) either the same or opposite signs. 
D) impossible to answer without additional information

Question 3

An electron and a proton

Accepted Answer

A) attract each other. 
B) repel each other. 
C) neither attract nor repel each other. 
A) attract each other. 
B) repel each other. 
C) neither attract nor repel each other.

Question 4

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

Accepted Answer

A) F/q. 
B) 4F/q. 
C) F/(2q). 
D) F/(4q). 
E) None of the above choices are correct. 
A) F/q. 
B) 4F/q. 
C) F/(2q). 
D) F/(4q). 
E) None of the above choices are correct.

Question 5

Particle A has twice the charge of nearby particle B.Compared to the force on Particle A,the force on Particle B is

Accepted Answer

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

Question 6

Two charges separated by one meter exert 1-N forces on each other.If the charges are pushed to 1/4 meter separation,the force on each charge will be

Accepted Answer

A) 1 N. 
B) 2 N. 
C) 4 N. 
D) 8 N. 
E) 16 N. 
A) 1 N. 
B) 2 N. 
C) 4 N. 
D) 8 N. 
E) 16 N.

Question 7

The electrical force between charges depends only on the charges'

Accepted Answer

A) magnitude. 
B) separation distance. 
C) magnitude and separation distance. 
D) None of the above choices are correct. 
A) magnitude. 
B) separation distance. 
C) magnitude and separation distance. 
D) None of the above choices are correct.

Question 8

Assume that 10 J of work is needed to push a charge,at rest,into an electric field.After the charge is released there,it flies back to its starting position and its kinetic energy there will be

Accepted Answer

A) zero. 
B) 5 J. 
C) 10 J. 
D) more than 10 J. 
E) impossible to predict without additional information. 
A) zero. 
B) 5 J. 
C) 10 J. 
D) more than 10 J. 
E) impossible to predict without additional information.

Question 9

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

Accepted Answer

A) the gravitational attraction. 
B) the electrical repulsion. 
C) neither - the forces are the same. 
A) the gravitational attraction. 
B) the electrical repulsion. 
C) neither - the forces are the same.

Question 10

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?

Accepted Answer

A) 20 N/C 
B) 30 N/C 
C) 60 N/C 
D) 120 N/C 
E) 240 N/C 
A) 20 N/C 
B) 30 N/C 
C) 60 N/C 
D) 120 N/C 
E) 240 N/C

Question 11

A conductor differs from an insulator in that a conductor

Accepted Answer

A) has more electrons than protons. 
B) has more protons than electrons. 
C) has more energy than an insulator. 
D) has faster moving molecules. 
E) none of these 
A) has more electrons than protons. 
B) has more protons than electrons. 
C) has more energy than an insulator. 
D) has faster moving molecules. 
E) none of these

Question 12

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

Accepted Answer

A) negative. 
B) smaller. 
C) loosely bound. 
D) all of these 
E) none of these 
A) negative. 
B) smaller. 
C) loosely bound. 
D) all of these 
E) none of these

Question 13

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

Accepted Answer

A) current. 
B) resistance. 
C) charge. 
D) voltage. 
E) None of the above choices are correct. 
A) current. 
B) resistance. 
C) charge. 
D) voltage. 
E) None of the above choices are correct.

Question 14

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

Accepted Answer

A) less than zero. 
B) zero. 
C) greater than zero. 
A) less than zero. 
B) zero. 
C) greater than zero.

Question 15

In the unlikely case of a lightning strike,it is worse to be inside a building framed with

Accepted Answer

A) steel. 
B) iron. 
C) aluminum. 
D) wood. 
A) steel. 
B) iron. 
C) aluminum. 
D) wood.

Question 16

A highly charged child's balloon is not dangerous because

Accepted Answer

A) rubber is not a good conductor of electricity. 
B) its outside surface is positively charged. 
C) the potential difference between the balloon and the child's hand is very small. 
D) None of the above choices are correct. 
A) rubber is not a good conductor of electricity. 
B) its outside surface is positively charged. 
C) the potential difference between the balloon and the child's hand is very small. 
D) None of the above choices are correct.

Question 17

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

Accepted Answer

A) 0)33 N. 
B) 0)11 N. 
C) 0 N. 
D) 3 N. 
E) 9 N. 
A) 0)33 N. 
B) 0)11 N. 
C) 0 N. 
D) 3 N. 
E) 9 N.

Question 18

The net charge on a charged capacitor depends on

Accepted Answer

A) the area of the capacitor plates. 
B) the distance between the capacitor plates. 
C) the medium between the capacitor plates. 
D) All of the above choices are correct. 
E) None of the above choices are correct - the net charge is zero. 
A) the area of the capacitor plates. 
B) the distance between the capacitor plates. 
C) the medium between the capacitor plates. 
D) All of the above choices are correct. 
E) None of the above choices are correct - the net charge is zero.

Exam 22: Electrostatics

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

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

An electron and a proton

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

Particle A has twice the charge of nearby particle B.Compared to the force on Particle A,the force on Particle B is

Two charges separated by one meter exert 1-N forces on each other.If the charges are pushed to 1/4 meter separation,the force on each charge will be

The electrical force between charges depends only on the charges'

Assume that 10 J of work is needed to push a charge,at rest,into an electric field.After the charge is released there,it flies back to its starting position and its kinetic energy there will be

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

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?

A conductor differs from an insulator in that a conductor

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

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

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

In the unlikely case of a lightning strike,it is worse to be inside a building framed with

A highly charged child's balloon is not dangerous because

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

The net charge on a charged capacitor depends on

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