8 Questions
| Attempts: 395

Questions and Answers

- 1.Two positive point charges are separated by a distance
*R*. If the distance between the charges is reduced to*R*/2, what happens to the total electric potential energy of the system?- A.
The total electric potential energy is doubled.

- B.
The total electric potential energy remains the same.

- C.
The total electric potential energy increases by a factor of 4.

- D.
The total electric potential energy is reduced to one-half of its original value.

- E.
The total electric potential energy is reduced to one-fourth of its original value.

- 2.Which one of the following statements best explains why it is possible to define an
*electrostatic potential*in a region of space that contains an*electrostatic field*?- A.
Work must be done to bring two positive charges closer together.

- B.
Like charges repel one another and unlike charges attract one another.

- C.
A positive charge will gain kinetic energy as it approaches a negative charge.

- D.
The work required to bring two charges together is independent of the path taken.

- E.
A negative charge will gain kinetic energy as it moves away from another negative charge.

- 3.Complete the following statement: The
*electron volt*is a unit of- A.
energy.

- B.
Electric field strength.

- C.
Electric force.

- D.
Electric potential difference.

- E.
Electric power.

- 4.Which one of the following statements is true concerning the work done by an external force in moving an electron at constant speed between two points in an electrostatic field?
- A.
The work done is always zero joules.

- B.
The work done is always positive.

- C.
The work done only depends on the speed of the electron.

- D.
The work done depends on the total distance covered.

- E.
The work done depends only on the displacement of the electron.

- 5.Two charged particles
**A**and**B**are located near one another. Both the*magnitude*and*direction*of the force that particle**A**exerts on particle**B**is*independent*of- A.
The sign of charge B.

- B.
The sign of charge A.

- C.
The distance between A and B.

- D.
the magnitude of the charge on B.

- E.
The magnitude and direction of the force are dependent on all of the choices.

- 6.Two uncharged, conducting spheres,
**A**and**B**, are held at rest on insulating stands and are in contact. A positively charged rod is brought near sphere**A**as suggested in the figure. While the rod is in place, someone moves sphere**B**away from**A**. How will the spheres be charged,*if at all*?- A.
Sphere A: Positive Sphere B: Positive

- B.
Sphere A: Positive Sphere B: Negative

- C.
Sphere A: Negative Sphere B: Positive

- D.
Sphere A: Negative Sphere B: Negative

- E.
Sphere A: Zero Sphere B: Zero

- 7.Complete the following statement: When a glass rod is rubbed with silk cloth, the rod becomes positively charged as
- A.
Positive charges are transferred from the silk to the rod.

- B.
Negative charges are transferred from the rod to the silk.

- C.
Positive charges are created on the surface of the rod.

- D.
negative charges are transferred from the silk to the rod.

- E.
positive charges are transferred from the rod to the silk.

- 8.Three objects have a net charge. Objects
**A**and**B**attract one another. Objects**B**and**C**also attract one another, but objects**A**and**C**repel one another. Which one of the following table entries is a possible combination of the signs of the net charges on these three objects?- A.
A: + B: + C: -

- B.
A: - B: + C: +

- C.
A: + B: - C: -

- D.
A: - B: + C: -

- E.
A: - B: - C: +

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