Unit 7 Concepts Quiz

10 Questions | By Jkeslin | Updated: Mar 22, 2022 | Attempts: 232

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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 E₀. 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