Question 1

A positive charge placed in an electric field experiences a force in the direction of the field.

Accepted Answer

A) True 
 B)False

Question 2

Four equal charges are located at the corners of a square of side d. If the magnitude of each charge is doubled, then what happens to the resultant force on each charge?

Accepted Answer

A)   It is doubled.
B)   It is quadrupled.
C)   It increases by a factor of 8.
D)   It remains the same.
E)   None of the other choices is correct.

Question 3

Three 3.0 μC charges are at the three corners of an square of side 0.50 m. The last corner is occupied by a -3.0 μC charge. Find the electric field at the center of the square.

Accepted Answer

The answer of Three 3.0 μC charges are at the...

Question 4

The charge on the proton is the same as

Accepted Answer

A)   the charge on the neutron.
B)   the charge on the neutron, but of the opposite sign.
C)   the charge on the atom.
D)   the charge on the electron.
E)   the charge on the electron, but of the opposite sign. E

Question 5

Three identical charges of 3.0 μC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any one of the charges?

Accepted Answer

A)   1.6 N
B)   1.8 N
C)   2.0 N
D)   2.2 N
E)   2.4 N

Question 6

FIGURE 19-9 
-Three equal point charges are placed at three of the corners of a square of side d as shown in Figure 19-9. Which of the arrows shown represents the direction of the net electric field at the center of the square?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   none of the above

Question 7

FIGURE 19-7 
-Three equal point charges are placed at the corners of a square of side d as shown in Figure 19-7. Which of the arrows shown represents the direction of the net electric field at the center of the square?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   none of the above

Question 8

FIGURE 19-6 
-Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in Figure 19-6. Which of the arrows shown represents the net force acting on the point charge with a charge +Q?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   none of the above A

Question 9

A conductor is placed in an electric field under electrostatic conditions. Which of the following statements is correct for this situation?

Accepted Answer

A)   The electric field is zero inside the conductor.
B)   All valence electrons go to the surface of the conductor.
C)   The electric field on the surface of the conductor is perpendicular to the surface.
D)   All of the other answers apply.

Question 10

An electron traveling along the +x-axis enters an electric field that is directed vertically down, i.e., along the negative y-axis. What will be the direction of the electric force acting on the electron after entering the electric field?

Accepted Answer

A)   downward
B)   upward
C)   to the left
D)   to the right
E)   into the page B

Question 11

FIGURE 19-14 
-Two point charges of magnitude + 7.00 μC and - 9.00 μC are placed along the x-axis at x = 0 cm and x = 40.0 cm, respectively. Where must a third charge, q, be placed along the x-axis so that it does not experience any net force because of the other two charges?

Accepted Answer

A)   0.200 m
B)   2.99 m
C)   - 0.187 m
D)   - 2.99 m
E)   0.187 m

Question 12

A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have?

Accepted Answer

A)   1.25 × 1013
B)   1.25 × 1019
C)   2.50 × 1013
D)   2.50 × 1019
E)   0

Question 13

How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

Accepted Answer

The answer of How far apart should two protons be...

Question 14

Two equal charges of magnitude +1 C are separated by a distance of 1 km. What is the force acting between these two charges?

Accepted Answer

A)   0.9 N
B)   9 N
C)   90 N
D)   900 N
E)   9000 N

Question 15

Q1 = 6.0 nC is at (0.30 m, 0) ; Q2 = -1.0 nC is at (0, 0.10 m) ; Q3 = 5.0 nC is at (0, 0) . What is the direction of the net force on the 5.0 nC charge?

Accepted Answer

A)   34° above +x-axis
B)   34° above -x-axis
C)   along the -x-axis
D)   56° above +x-axis
E)   56° above -x-axis

Question 16

Two point charges of + 5.00 μC and + 8.00 μC are placed inside a cube of edge length 0.100 m. The net electric flux due to these charges is given by

Accepted Answer

A)   0.340 × 106 Nm2/C
B)   0.450 × 106 Nm2/C
C)   1.47 × 106 Nm2/C
D)   3.80 × 106 Nm2/C
E)   4.20 × 106 Nm2/C

Question 17

The Coulomb force between two charges can be attractive or repulsive.

Accepted Answer

A) True 
 B)False

Question 18

By what method will a positively charged rod produce a negative charge on a conducting sphere that is placed on an insulating surface?

Accepted Answer

A)   by means of conduction
B)   by means of convection
C)   by means of induction
D)   None of the other choices is correct.

Question 19

A metal sphere of radius 10 cm carries a charge of +2.0 μC. What is the magnitude of the electric field 5.0 cm from the sphere's surface?

Accepted Answer

A)   4.0 × 105 N/C
B)   8.0 × 105 N/C
C)   4.0 × 107 N/C
D)   8.0 × 107 N/C
E)   4.0 × 109 N/C

Question 20

A force of 6.0 N acts on a charge of 3.0 μC when it is placed in a uniform electric field. What is the magnitude of this electric field?

Accepted Answer

A)   18 MN/C
B)   2.0 MN/C
C)   1.0 MN/C
D)   0.50 MN/C
E)   130 MN/C

Exam 19: Electric Charges, Forces, and Fields

A positive charge placed in an electric field experiences a force in the direction of the field.

Correct AnswerverifiedShow Answer

Four equal charges are located at the corners of a square of side d. If the magnitude of each charge is doubled, then what happens to the resultant force on each charge?

Correct AnswerverifiedShow Answer

Three 3.0 μC charges are at the three corners of an square of side 0.50 m. The last corner is occupied by a -3.0 μC charge. Find the electric field at the center of the square.

Correct AnswerverifiedShow Answer

The charge on the proton is the same as

Correct AnswerverifiedE

Three identical charges of 3.0 μC are placed at the vertices of an equilateral triangle which measures 30 cm on a side. What is the magnitude of the electrostatic force which acts on any one of the charges?

Correct AnswerverifiedShow Answer

FIGURE 19-9 -Three equal point charges are placed at three of the corners of a square of side d as shown in Figure 19-9. Which of the arrows shown represents the direction of the net electric field at the center of the square?

Correct AnswerverifiedShow Answer

FIGURE 19-7 -Three equal point charges are placed at the corners of a square of side d as shown in Figure 19-7. Which of the arrows shown represents the direction of the net electric field at the center of the square?

Correct AnswerverifiedShow Answer

FIGURE 19-6 -Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in Figure 19-6. Which of the arrows shown represents the net force acting on the point charge with a charge +Q?

Correct AnswerverifiedA

A conductor is placed in an electric field under electrostatic conditions. Which of the following statements is correct for this situation?

Correct AnswerverifiedShow Answer

An electron traveling along the +x-axis enters an electric field that is directed vertically down, i.e., along the negative y-axis. What will be the direction of the electric force acting on the electron after entering the electric field?

Correct AnswerverifiedB

FIGURE 19-14 -Two point charges of magnitude + 7.00 μC and - 9.00 μC are placed along the x-axis at x = 0 cm and x = 40.0 cm, respectively. Where must a third charge, q, be placed along the x-axis so that it does not experience any net force because of the other two charges?

Correct AnswerverifiedShow Answer

A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have?

Correct AnswerverifiedShow Answer

How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

Correct AnswerverifiedShow Answer

Two equal charges of magnitude +1 C are separated by a distance of 1 km. What is the force acting between these two charges?

Correct AnswerverifiedShow Answer

Q1 = 6.0 nC is at (0.30 m, 0) ; Q2 = -1.0 nC is at (0, 0.10 m) ; Q3 = 5.0 nC is at (0, 0) . What is the direction of the net force on the 5.0 nC charge?

Correct AnswerverifiedShow Answer

Two point charges of + 5.00 μC and + 8.00 μC are placed inside a cube of edge length 0.100 m. The net electric flux due to these charges is given by

Correct AnswerverifiedShow Answer

The Coulomb force between two charges can be attractive or repulsive.

Correct AnswerverifiedShow Answer

By what method will a positively charged rod produce a negative charge on a conducting sphere that is placed on an insulating surface?

Correct AnswerverifiedShow Answer

A metal sphere of radius 10 cm carries a charge of +2.0 μC. What is the magnitude of the electric field 5.0 cm from the sphere's surface?

Correct AnswerverifiedShow Answer

A force of 6.0 N acts on a charge of 3.0 μC when it is placed in a uniform electric field. What is the magnitude of this electric field?

Correct AnswerverifiedShow Answer

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Q₁ = 6.0 nC is at (0.30 m, 0) ; Q₂ = -1.0 nC is at (0, 0.10 m) ; Q₃ = 5.0 nC is at (0, 0) . What is the direction of the net force on the 5.0 nC charge?

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