Chapter 17: Electric Potential
- 1.Which of the following is not a vector?
- A.
Electric force
- B.
Electric field
- C.
Electric potential
- D.
Electric line of force
- 2.One joule per coulomb is a
- A.
Newton.
- B.
Volt.
- C.
Electron-volt.
- D.
Farad.
- 3.Two identical aluminum objects are insulated from their surroundings. Object A has a net charge of excess electrons. Object B is grounded. Which object is at a higher potential?
- A.
A
- B.
B
- C.
Both are at the same potential.
- D.
Cannot be determined without more information
- 4.For a proton moving in the direction of the electric field
- A.
Its potential energy increases and its electric potential decreases.
- B.
Its potential energy decreases and its electric potential increases.
- C.
Its potential energy increases and its electric potential increases.
- D.
Its potential energy decreases and its electric potential decreases.
- 5.For an electron moving in a direction opposite to the electric field
- A.
Its potential energy increases and its electric potential decreases.
- B.
Its potential energy decreases and its electric potential increases.
- C.
Its potential energy increases and its electric potential increases.
- D.
Its potential energy decreases and its electric potential decreases.
- 6.Several electrons are placed on a hollow conducting sphere. They
- A.
Clump together on the sphere's outer surface.
- B.
Clump together on the sphere's inner surface.
- C.
Become uniformly distributed on the sphere's outer surface.
- D.
Become uniformly distributed on the sphere's inner surface.
- 7.A small charged ball is accelerated from rest to a speed v by a 500 V potential difference. If the potential difference is changed to 2000 V, what will the new speed of the ball be?
- A.
V
- B.
2v
- C.
4v
- D.
16v
- 8.A surface on which all points are at the same potential is referred to as
- A.
A constant electric force surface.
- B.
A constant electric field surface.
- C.
An equipotential surface.
- D.
An equivoltage surface.
- 9.A negative charge is moved from point A to point B along an equipotential surface.
- A.
The negative charge performs work in moving from point A to point B.
- B.
Work is required to move the negative charge from point A to point B.
- C.
Work is both required and performed in moving the negative charge from point A to point B.
- D.
No work is required to move the negative charge from point A to point B.
- 10.An equipotential surface must be
- A.
Parallel to the electric field at any point.
- B.
Perpendicular to the electric field at any point.
- 11.The energy acquired by a particle carrying a charge equal to that on the electron as a result of moving through a potential difference of one volt is referred to as
- A.
A joule.
- B.
An electron-volt.
- C.
A proton-volt.
- D.
A coulomb.
- 12.The electron-volt is a unit of
- A.
Voltage.
- B.
Current.
- C.
Power.
- D.
Energy.
- 13.One electron-volt corresponds to
- A.
8.0 * 10^(-20) J.
- B.
1.6 * 10^(-19) J.
- C.
9.5 * 10^(-17) J.
- D.
1.9 * 10^(-16) J.
- 14.The absolute potential at a distance of 2.0 m from a positive point charge is 100 V. What is the absolute potential 4.0 m away from the same point charge?
- A.
25 V
- B.
50 V
- C.
200 V
- D.
400 V
- 15.The absolute potential at a distance of 2.0 m from a negative point charge is -100 V. What is the absolute potential 4.0 m away from the same point charge?
- A.
-25 V
- B.
-50 V
- C.
-200 V
- D.
-400 V
- 16.The absolute potential at the exact center of a square is 3.0 V when a charge of +Q is located at one of the square's corners. What is the absolute potential at the square's center when each of the other corners is also filled with a charge of +Q?
- A.
Zero
- B.
3.0 V
- C.
9.0 V
- D.
12 V
- 17.The absolute potential at the center of a square is 3.0 V when a charge of +Q is located at one of the square's corners. What is the absolute potential at the square's center when a second charge of -Q is placed at one of the remaining corners?
- A.
Zero
- B.
3.0 V
- C.
6.0 V
- D.
9.0 V
- 18.Electric dipoles always consist of two charges that are
- A.
Equal in magnitude; opposite in sign.
- B.
Equal in magnitude; both are negative.
- C.
Equal in magnitude; both are positive.
- D.
Unequal in magnitude; opposite in sign.
- 19.One coulomb per volt is a
- A.
Joule.
- B.
Electron-volt.
- C.
Farad.
- D.
Watt.
- 20.Two parallel-plate capacitors are identical in every respect except that one has twice the plate area of the other. If the smaller capacitor has capacitance C, the larger one has capacitance
- A.
C/2.
- B.
C.
- C.
2C.
- D.
4C.
- 21.A parallel-plate capacitor has a capacitance of C. If the area of the plates is doubled and the distance between the plates is halved, what is the new capacitance?
- A.
C/4
- B.
C/2
- C.
2C
- D.
4C
- 22.A battery charges a parallel-plate capacitor fully and then is removed. The plates are immediately pulled apart. (With the battery disconnected, the amount of charge on the plates remains constant.) What happens to the potential difference between the plates as they are being separated?
- A.
It increases.
- B.
It decreases.
- C.
It remains constant.
- D.
Cannot be determined from the information given
- 23.If the electric field between the plates of a given capacitor is weakened, the capacitance of that capacitor
- A.
Increases.
- B.
Decreases.
- C.
Does not change.
- D.
Cannot be determined from the information given
- 24.The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. During this process, the amount of charge on the plates must
- A.
Increase.
- B.
Decrease.
- C.
Remain constant.
- D.
Either increase or decrease. There is no way to tell from the information given.
- 25.The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
- A.
It increases.
- B.
It decreases.
- C.
It remains constant.
- D.
Cannot be determined from the information given
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