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Unit 8 Quiz#1

Equations:

1. In a neutral atom the number of electrons is equal to

  1. the number of protons.
  2. the number of neutrons.
  3. the sum of the number of protons and neutrons.
  4. the difference between the number of protons and neutrons.
  5. the product of the number of protons and neutrons.

 

2. An uncharged body would acquire a negative charge if it

  1. gained some atoms.
  2. lost some neutrons.
  3. gained some electrons.
  4. lost some electrons.
  5. gained some protons.

 

3. A positively charged body must have

  1. an excess of neutrons.
  2. an excess of electrons.
  3. a deficiency of protons.
  4. a deficiency of electrons.

 

4. A positively charged balloon will be attracted to an electrically neutral wooden cabinet. The explanation of why this occurs is that

  1. the molecules of the wooden cabinet are able to polarize and be attracted to the balloon.
  2. the molecules of the balloon are able to polarize and thus be attracted to the cabinet.
  3. the balloon is a conductor and the wood is an insulator; opposites attract.
  4. the balloon is an insultor and the wood is a conductor; opposites attract.

 

5. A plastic tube is charged by rubbing it with fur. The plastic tude acquires a negative charge. This is evidence that

  1. plastic molecules have a greater attraction for electrons than fur molecules.
  2. fur molecules have a greater attraction for electrons than plastic molecules.
  3. plastic is an insulator and fur is a conductor.
  4. fur is a insulator and plastic is a conductor.

 

6. A neutral electroscope is charged by contact using a positively charged electrophorus plate. The electroscope

  1. acquires a positive charge
  2. acquires a negative charge
  3. will merely have a temporary separation of postive and negative charge.

 

7. A physics student, standing on the ground, touches a plastic baseball bat to a negatively charged electroscope. This will cause

  1. the electroscope to be grounded as electrons flow out of the electroscope.
  2. the needle of the electroscope to deflect even more.
  3. the baseball bat to acquire an excess of protons.
  4. ... absolutely nothing to happen.

 

8. A negatively charged plastic tube is used to charge a metal sphere by the process of induction. The charge on the metal sphere will be

  1. positive.
  2. negative.
  3. not enough information to tell.

 

9. An electroscope has an overall negative charge. Thus, the needle of the electroscope is deflected. A positively charged balloon is held just above the plate of the electroscope (without making contact with it). The needle will

  1. deflect even more.
  2. return to the upright position.
  3. remain in a deflected position since there is no contact between balloon and electroscope.

 

10. An electroscope has an overall positive charge. Jin Erator touches the metal base of the electroscope and grounds the electroscope. The electroscope is no longer charged after the grounding process because

  1. protons flowed through Jin's body into the ground.
  2. electrons flowed through Jin's body into the ground.
  3. electrons flowed throuch Jin's body into the electroscope.
  4. Jin must have been negatively charged prior to touching the electroscope.

 

11. The needle of a positively charged electroscope will deflect even more when a charged object is brought near the plate of the electroscope. The object MUST be

  1. a conductor.
  2. an insulator.
  3. positively charged.
  4. negatively charged.
  5. neutral.

 

12. A plastic comb is used to comb a student's hair. The comb is then brought near a negatively charged metal electroscope. If the needle of the electroscope deflects further, the comb has

  1. an excess of electrons.
  2. an excess of protons.
  3. an excess of neutrons.
  4. a deficiency of neutrons.
  5. equal numbers of electrons and protons.

 

13. The electric force between two charged spheres is 18 units. If the distance between the centers of the spheres is tripled, the resulting electric force will be

  1. 6 units.
  2. 2 units.
  3. 3 units.
  4. 54 units.

 

14. A metal sphere has a deficit of 1.0 x 1012 electrons (charge on 1 electron = 1.6 x 10-19 C). What is the charge on the sphere?

  1. 6.25 x 1030 C
  2. 1.6 x 10-7 C
  3. -1.6 x 10-7 C
  4. 1.6 x 10-31 C
  5. -1.6 x 10-31 C

 

15. The force of attraction between two point charges can be doubled by

  1. halving the distance between them.
  2. doubling the distance between them.
  3. doubling the charge on both objects.
  4. doubling the charge on one object, only.

 

16. Objects A, B, and C are oriented as shown in the diagram to the right. What arrow best describes the direction of the net electrical force on object B?

 

 

17. Two oppositely charged balloons with a charge of +5.0 x 10-6 C and -4.0 x 10-7 C experience an electric attractive force with a magnitude of .072 N. Determine the distance between the centers of the two balloons. PSYW

 

 

 


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Last updated on 9/29/98.