10 Questions
| Attempts: 232

Questions and Answers

- 1.Two charged balls are repelling each other as they hang from the ceiling. What can you say about their charges?
- A.
One is positive, the other is negative

- B.
Both are positive

- C.
Both are negative

- D.
Both are positive or both are negative

- 2.A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive-charged rod held near the ball. The charge of the ball must be:
- A.
Positive

- B.
Negative

- C.
Neutral

- D.
Positive or neutral

- E.
Negative or neutral

- 3.The force between two charges separated by a distance d is F. If the charges are pulled apart to a distance 3d, what is the force on each charge?
- A.
9F

- B.
3F

- C.
F

- D.
1/3F

- E.
1/9F

- 4.A proton and an electron are held apart a distance of 1 m and then released. As they approach each other, what happens to the force between them?
- A.
It gets bigger

- B.
It gets smaller

- C.
It stays the same

- 5.You are sitting a certain distance from a point charge, and you measure an electric field of E
_{0}. If the charge is doubled and your distance from the charge is also doubled, what is the electric field strength now?- A.
4E

- B.
2E

- C.
E

- D.
1/2E

- E.
1/4E

- 6.A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which feels the larger electric force?
- A.
Proton

- B.
Electron

- C.
Both feel the same force

- D.
Neither – there is no force

- E.
They feel the same magnitude force but opposite direction

- 7.Capacitor C1 is connected across a battery of 5 V. An identical capacitor C2 is connected across a battery of 10 V. Which one has the most charge?
- A.
C1

- B.
C2

- C.
Both have the same charge

- D.
It depends on other factors

- 8.What must be done to a capacitor in order to increase the amount of charge it can hold (for a constant voltage)?
- A.
Increase the area of the plates

- B.
Decrease separation between the plates

- C.
Decrease the area of the plates

- D.
Either (1) or (2)

- E.
Either (2) or (3)

- 9.A parallel-plate capacitor initially has a potential difference of 400 V and is then disconnected from the charging battery. If the plate spacing is now doubled (without changing Q), what is the new value of the voltage?
- A.
100 V

- B.
200 V

- C.
400 V

- D.
800 V

- E.
1600 V

- 10.Consider point charges of +Q and +4Q, which are separated by 3.0 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?
- A.
There is no such point possible.

- B.
1.0 m from the +Q charge

- C.
1.0 m from the +4Q charge

- D.
0.60 m from the +Q charge

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