## Description

## Test Bank For Physics Principles with Applications 7th Edition By Giancoli

**MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.**

1) | Electrically neutral objects cannot exert an electrical force on each other, but they can exert a | 1) | |

gravitational force on each other. | |||

A) True | B) False | ||

2) | If two objects are electrically attracted to each other, | 2) |

- the objects could be electrically neutral.
- both objects must be positively charged.
- one object must be negatively charged and the other object must be positively charged.
- both objects must be negatively charged.
- None of the above statements are absolutely true.

3) | A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic | 3) | ||

sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then | ||||

is separated from the sphere by a small distance. After the rod is separated, the rod | ||||

A) is attracted to the sphere. | ||||

B) feels no force due to the sphere. | ||||

C) is repelled by the sphere. | ||||

4) | A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere | 4) | ||

that is connected to ground. After waiting a few seconds, the ground connection is removed | ||||

(without touching the sphere), and after that the rod is also removed. The sphere is now | ||||

A) positively charged. | B) neutral. | C) negatively charged. | ||

5) | 5) |

X and Y are two initially uncharged metal spheres on insulating stands, and they are in contact with each other. A positively charged rod *R* is brought close to X as shown in part (a) of the figure. Sphere Y is now moved away from X, as shown in part (b). What are the final charge states of X and Y?

- X is positive and Y is neutral.
- X is negative and Y is positive.
- Both X and Y are neutral.
- Both X and Y are negative.
- X is neutral and Y is positive.

1

6) Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal | 6) |

sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily | |

connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state | |

A) spheres #1 and #2 both carry negative charge. | |

B) spheres #1 and #2 both carry positive charge. | |

C) spheres #1 and #2 are still uncharged. | |

D) sphere #1 carries negative charge and #2 carries positive charge. | |

E) sphere #1 carries positive charge and #2 carries negative charge. | |

7) A negatively-charged rod is brought close to (but does not touch) two neutral spheres that are in | 7) |

contact with each other but insulated from the ground. If the two spheres are then separated, what | |

kind of charge will be on the spheres? |

- The sphere near the charged rod becomes negative and the other one becomes positive.
- The spheres do not get any charge.
- Both spheres become negative.
- Both spheres become positive.
- The sphere near the charged rod becomes positive and the other one becomes negative.

8) | Two tiny beads are 25 cm apart with no other charges or fields present. Bead A carries 10 µC of | 8) |

charge and bead B carries 1 µC. Which one of the following statements is true about the | ||

magnitudes of the electric forces on these beads? | ||

A) The force on B is 10 times the force on A. | ||

B) The force on A is 100 times the force on B. | ||

C) The force on A is exactly equal to the force on B. | ||

D) The force on A is 10 times the force on B. | ||

E) The force on B is 100 times the force on A. | ||

9) | Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of | 9) |

excess charge and the other one carries +1µC of charge. No other charges or fields are present. | ||

Which of the following statements are true about them as they move away from each other? | ||

(There may be more than one correct choice.) | ||

A) The acceleration of the balls keeps increasing. | ||

B) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. | ||

C) The balls always have accelerations of equal magnitude. | ||

D) The speed of the balls keeps increasing. | ||

E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball. | ||

10) | In outer space, a positive charge q is released near a positive fixed charge Q, as shown in the figure. |
10) |

As q moves away from Q, what is true about the motion of q? (There may be more than one correct |
||

choice.) |

- It will move with increasing speed.
- It will move with decreasing acceleration.
- It will move with constant acceleration.
- It will move with increasing acceleration.

It will move with decreasing speed.

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