Question 1

One very small uniformly charged plastic ball is located directly above another such charge in a test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the distance between the balls in the test tube would become

Accepted Answer

A)    d.
B)   2d.
C)   4d.
D)   8d.E) C) and D)
F) B) and D) B

Question 2

In the figure, all the charges are point charges and the charge in the middle is Q = -3.1 nC. For what charge q1 will charge q2 be in static equilibrium? 1 will charge q2 be in static equilibrium?   A)  12 nC B)  6.2 nC C)  3.1 nC D)  25 nC" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   12 nC
B)   6.2 nC
C)   3.1 nC
D)   25 nCE) B) and C)
F) None of the above

Question 3

In the figure, charge q1 = 3.1 × 10-6 C is placed at the origin and charge q2 = -8.7 × 10-6 C is placed on the x-axis, at x = -0.20 m. Where along the x-axis can a third charge Q = -8.3 µC be placed such that the resultant force on this third charge is zero?

Accepted Answer

Question 4

A small sphere with a mass of 441 g is moving upward along the vertical +y-axis when it encounters an electric field of 5.00 N/C 2      , what is the charge that it carries? A)  1.15 C B)  -1.15 C C)  1150 C D)  -1150 C" class="answers-bank-image d-inline" rel="preload" > . If, due to this field, the sphere suddenly acquires a horizontal acceleration of 13.0 m/s2 
  2      , what is the charge that it carries? A)  1.15 C B)  -1.15 C C)  1150 C D)  -1150 C" class="answers-bank-image d-inline" rel="preload" >
, what is the charge that it carries?

Accepted Answer

A)   1.15 C
B)   -1.15 C
C)   1150 C
D)   -1150 CE) None of the above
F) A) and B) A

Question 5

The point charge at the bottom of the figure is Q = +17 nC, and the curve is a circular arc. What is the magnitude of the force on the charge Q due to the other point charges shown? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)  0 = 8.99 × 109 N ∙ m2/C2)    A)  1.9 × 10-4 N B)  1.2 × 10-4 N C)  1.6 × 10-4 N D)  2.3 × 10-4 N" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1.9 × 10-4 N
B)   1.2 × 10-4 N
C)   1.6 × 10-4 N
D)   2.3 × 10-4 NE) C) and D)
F) A) and B)

Question 6

Charge Q1 = 6.0 nC is at (0.30 m, 0), charge Q2 = -1.0 nC is at (0, 0.10 m), and charge Q3 = 5.0 nC is at (0, 0). What are the magnitude and direction of the net electrostatic force on the 5.0-nC charge due to the other charges? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Accepted Answer

5.4 × 10^-6 N...

Question 7

A metal sphere of radius 10 cm carries a charge of +2.0 μC uniformly distributed over its surface. What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Accepted Answer

A)   4.0 × 105 N/C
B)   8.0 × 105 N/C
C)   4.2 × 106 N/C
D)   4.0 × 107 N/C
E)   8.0 × 107 N/CF) None of the above
G) B) and C)

Question 8

A point charge Q is located a short distance from a point charge 3Q, and no other charges are present. If the electrical force on Q is F, what is the electrical force on 3Q?

Accepted Answer

A)   F/3
B)   F/ 
C)   F
D)    F
E)   3FF) None of the above
G) A) and B)

Question 9

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually leaks off of both spheres. When each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

Accepted Answer

A)   1/16 F.
B)   1/8 F.
C)   1/4 F.
D)   1/2 F.E) None of the above
F) A) and C)

Question 10

The figure shows two tiny 5.0-g spheres suspended from two very thin 1.0-m-long threads. The spheres repel each other after being charged to +91 nC and hang at rest as shown. What is the angle θ? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)  0 = 8.99 × 109 N ∙ m2/C2)    A)  4.1° B)  8.2° C)  12° D)  16°" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   4.1°
B)   8.2°
C)   12°
D)   16°E) A) and D)
F) B) and D)

Question 11

A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C)

Accepted Answer

A)   1.25 × 1013
B)   1.25 × 1019
C)   2.50 × 1013
D)   2.50 × 1019E) B) and D)
F) None of the above

Question 12

A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Accepted Answer

A)   25 C
B)   1.0 C
C)   10 nC
D)   0.025 C
E)   25 nCF) B) and E)
G) B) and C) E

Question 13

Two identical small conducting spheres are separated by 0.60 m. The spheres carry different amounts of charge and each sphere experiences an attractive electric force of 10.8N. The total charge on the two spheres is -24 μC. The two spheres are now connected by a slender conducting wire, which is then removed. The electric force on each sphere is closest to

Accepted Answer

A)   zero.
B)   3.6 N, attractive.
C)   5.4 N, attractive.
D)   3.6 N, repulsive.
E)   5.4 N, repulsive.F) C) and D)
G) B) and D)

Question 14

What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

Accepted Answer

A)   2.1 × 107 N/C
B)   2.4 × 106 N/C
C)   4.5 × 106 N/C
D)   6.4 × 106 N/CE) C) and D)
F) All of the above

Question 15

A small glass bead has been charged to 8.0 nC. What is the magnitude of the electric field 2.0 cm from the center of the bead? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Accepted Answer

A)   1.8 × 105 N/C
B)   3.6 × 103 N/C
C)   1.4 × 10-3 N/C
D)   3.6 × 10-6 N/CE) B) and C)
F) A) and B)

Question 16

When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to

Accepted Answer

A)   1.0 N.
B)   4.0 N.
C)   16 N.
D)   0.25 N.
E)   0.063 N.F) B) and E)
G) A) and B)

Question 17

In the figure Q = 5.8 nC and all other quantities are accurate to 2 significant figures. What is the magnitude of the force on the charge Q? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)  0 = 8.99 × 109 N ∙ m2/C2)    A)  1.8 × 10-3 N B)  1.0 × 10-3 N C)  9.0 × 10-4 N D)  1.2 × 10-3 N" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   1.8 × 10-3 N
B)   1.0 × 10-3 N
C)   9.0 × 10-4 N
D)   1.2 × 10-3 NE) B) and D)
F) All of the above

Question 18

In the figure, a small spherical insulator of mass 6.00 × 10-2 kg and charge +0.400 μC is hung by a thin wire of negligible mass. A charge of -0.220 μC is held 0.290 m away from the sphere and directly to the right of it, so the wire makes an angle θ with the vertical, as shown. What is the angle θ? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)  -2 kg and charge +0.400 μC is hung by a thin wire of negligible mass. A charge of -0.220 μC is held 0.290 m away from the sphere and directly to the right of it, so the wire makes an angle θ with the vertical, as shown. What is the angle θ? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)    A)  0.917° B)  1.10° C)  1.30° D)  1.50° E)  1.70°" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   0.917°
B)   1.10°
C)   1.30°
D)   1.50°
E)   1.70°F) None of the above
G) All of the above

Question 19

When two point charges are a distance d part, the electric force that each one feels from the other has magnitude F. In order to make this force twice as strong, the distance would have to be changed to

Accepted Answer

A)   2d.
B)    d.
C)   d/ 
D)   d/2.
E)   d/4.F) A) and E)
G) All of the above

Question 20

A +7.00 μC point charge and -9.00 μC point charge are placed along the x-axis at x = 0.000 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 electric force due to 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 mF) A) and D)
G) A) and C)

Exam 25: Electric Charges and Forces

One very small uniformly charged plastic ball is located directly above another such charge in a test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the distance between the balls in the test tube would become

Correct Answer
verified
B

In the figure, all the charges are point charges and the charge in the middle is Q = -3.1 nC. For what charge q₁ will charge q₂ be in static equilibrium?

Correct Answer
verified

In the figure, charge q₁ = 3.1 × 10^-6 C is placed at the origin and charge q₂ = -8.7 × 10^-6 C is placed on the x-axis, at x = -0.20 m. Where along the x-axis can a third charge Q = -8.3 µC be placed such that the resultant force on this third charge is zero?

Correct Answer
verified

A small sphere with a mass of 441 g is moving upward along the vertical +y-axis when it encounters an electric field of 5.00 N/C . If, due to this field, the sphere suddenly acquires a horizontal acceleration of 13.0 m/s² , what is the charge that it carries?

Correct Answer
verified
A

The point charge at the bottom of the figure is Q = +17 nC, and the curve is a circular arc. What is the magnitude of the force on the charge Q due to the other point charges shown? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Charge Q₁ = 6.0 nC is at (0.30 m, 0), charge Q₂ = -1.0 nC is at (0, 0.10 m), and charge Q₃ = 5.0 nC is at (0, 0). What are the magnitude and direction of the net electrostatic force on the 5.0-nC charge due to the other charges? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified
5.4 × 10^-6 N...
View Answer

A metal sphere of radius 10 cm carries a charge of +2.0 μC uniformly distributed over its surface. What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

A point charge Q is located a short distance from a point charge 3Q, and no other charges are present. If the electrical force on Q is F, what is the electrical force on 3Q?

Correct Answer
verified

Correct Answer
verified

The figure shows two tiny 5.0-g spheres suspended from two very thin 1.0-m-long threads. The spheres repel each other after being charged to +91 nC and hang at rest as shown. What is the angle θ? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10^-19 C)

Correct Answer
verified

A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified
E

Correct Answer
verified

What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

Correct Answer
verified

A small glass bead has been charged to 8.0 nC. What is the magnitude of the electric field 2.0 cm from the center of the bead? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to

Correct Answer
verified

In the figure Q = 5.8 nC and all other quantities are accurate to 2 significant figures. What is the magnitude of the force on the charge Q? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Correct Answer
verified

When two point charges are a distance d part, the electric force that each one feels from the other has magnitude F. In order to make this force twice as strong, the distance would have to be changed to

Correct Answer
verified

A +7.00 μC point charge and -9.00 μC point charge are placed along the x-axis at x = 0.000 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 electric force due to the other two charges?

Correct Answer
verified

Exam 25: Electric Charges and Forces

One very small uniformly charged plastic ball is located directly above another such charge in a test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the distance between the balls in the test tube would become

Correct AnswerverifiedB

In the figure, all the charges are point charges and the charge in the middle is Q = -3.1 nC. For what charge q1 will charge q2 be in static equilibrium?

Correct AnswerverifiedShow Answer

In the figure, charge q1 = 3.1 × 10-6 C is placed at the origin and charge q2 = -8.7 × 10-6 C is placed on the x-axis, at x = -0.20 m. Where along the x-axis can a third charge Q = -8.3 µC be placed such that the resultant force on this third charge is zero?

Correct AnswerverifiedShow Answer

A small sphere with a mass of 441 g is moving upward along the vertical +y-axis when it encounters an electric field of 5.00 N/C . If, due to this field, the sphere suddenly acquires a horizontal acceleration of 13.0 m/s2 , what is the charge that it carries?

Correct AnswerverifiedA

The point charge at the bottom of the figure is Q = +17 nC, and the curve is a circular arc. What is the magnitude of the force on the charge Q due to the other point charges shown? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

Charge Q1 = 6.0 nC is at (0.30 m, 0), charge Q2 = -1.0 nC is at (0, 0.10 m), and charge Q3 = 5.0 nC is at (0, 0). What are the magnitude and direction of the net electrostatic force on the 5.0-nC charge due to the other charges? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct Answerverified5.4 × 10-6 N...View AnswerShow Answer

A metal sphere of radius 10 cm carries a charge of +2.0 μC uniformly distributed over its surface. What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

A point charge Q is located a short distance from a point charge 3Q, and no other charges are present. If the electrical force on Q is F, what is the electrical force on 3Q?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The figure shows two tiny 5.0-g spheres suspended from two very thin 1.0-m-long threads. The spheres repel each other after being charged to +91 nC and hang at rest as shown. What is the angle θ? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

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? (e = 1.60 × 10-19 C)

Correct AnswerverifiedShow Answer

A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct AnswerverifiedE

Correct AnswerverifiedShow Answer

What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

Correct AnswerverifiedShow Answer

A small glass bead has been charged to 8.0 nC. What is the magnitude of the electric field 2.0 cm from the center of the bead? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to

Correct AnswerverifiedShow Answer

In the figure Q = 5.8 nC and all other quantities are accurate to 2 significant figures. What is the magnitude of the force on the charge Q? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When two point charges are a distance d part, the electric force that each one feels from the other has magnitude F. In order to make this force twice as strong, the distance would have to be changed to

Correct AnswerverifiedShow Answer

A +7.00 μC point charge and -9.00 μC point charge are placed along the x-axis at x = 0.000 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 electric force due to the other two charges?

Correct AnswerverifiedShow Answer

Correct Answer
verified
B

In the figure, all the charges are point charges and the charge in the middle is Q = -3.1 nC. For what charge q₁ will charge q₂ be in static equilibrium?

Correct Answer
verified

In the figure, charge q₁ = 3.1 × 10^-6 C is placed at the origin and charge q₂ = -8.7 × 10^-6 C is placed on the x-axis, at x = -0.20 m. Where along the x-axis can a third charge Q = -8.3 µC be placed such that the resultant force on this third charge is zero?

Correct Answer
verified

A small sphere with a mass of 441 g is moving upward along the vertical +y-axis when it encounters an electric field of 5.00 N/C . If, due to this field, the sphere suddenly acquires a horizontal acceleration of 13.0 m/s² , what is the charge that it carries?

Correct Answer
verified
A

The point charge at the bottom of the figure is Q = +17 nC, and the curve is a circular arc. What is the magnitude of the force on the charge Q due to the other point charges shown? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Charge Q₁ = 6.0 nC is at (0.30 m, 0), charge Q₂ = -1.0 nC is at (0, 0.10 m), and charge Q₃ = 5.0 nC is at (0, 0). What are the magnitude and direction of the net electrostatic force on the 5.0-nC charge due to the other charges? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified
5.4 × 10^-6 N...
View Answer

A metal sphere of radius 10 cm carries a charge of +2.0 μC uniformly distributed over its surface. What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The figure shows two tiny 5.0-g spheres suspended from two very thin 1.0-m-long threads. The spheres repel each other after being charged to +91 nC and hang at rest as shown. What is the angle θ? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

A piece of plastic has a net charge of +2.00 μC. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10^-19 C)

Correct Answer
verified

A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified
E

Correct Answer
verified

Correct Answer
verified

A small glass bead has been charged to 8.0 nC. What is the magnitude of the electric field 2.0 cm from the center of the bead? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Correct Answer
verified

In the figure Q = 5.8 nC and all other quantities are accurate to 2 significant figures. What is the magnitude of the force on the charge Q? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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