Electrostatics Review

For 1-17 below, use the word bank at the bottom to complete the blanks with the most appropriate word(s).

  1. The proton has a ______charge, while the electron has a ______charge.
  2. Object with an equal number of protons and electrons are ______.
  3. Electrostatic charges are a result of the movement of this particle: ______.
  4. A neutral object becomes ______charged if electrons are removed from it.
  5. Unlike (different) charges ______one another.
  6. Rubber and plastic are examples of ______.
  7. The process of charging a neutral body by touching it with a charged body is called charging by ______.
  8. Similar charges will ______one another.
  9. Charge on an object is measured in units of ______.
  10. A charged object will ______a neutral object.
  11. When two objects are rubbed together, this is charging by ______.
  12. Removal of charge from an object by connecting it to water or the Earth is called ______.
  13. How easily charge flows through an object is its ______.
  14. An object designed to attract lightning strikes is called a ______.
  15. Bringing a charged object near (but not touching) a neutral will charge the neutral object by ______.
  16. If you are inside a hollow conductor shell, you are safe from electricity, the shell is functioning as a(n) ______
  17. A special class of materials with very low resistance are known as ______.

Positive(ly) negative neutral resistance friction

conduction polarization Coulomb conductor(s)Insulator(s)

lightning rodattractrepelproton(s) electron(s)neutron(s)

Faraday Cagegrounding

For 1-6 below, determine which of the above situations applies best.

______1. A sphere is charged by conduction by a positive rod.

______2. A sphere is charged by conduction by a negative rod.

______3. A positively charged rod is brought near the left side of the sphere.

______4. A positively charged rod is brought near the right side of the sphere.

______5. A sphere has been grounded.

______6. A sphere is charged by friction by rabbit fur, and the fur gets a positive charge.

For 7 & 8 below, use the fact that e = - 1.6x10-19 C to answer the following.

7. Taking away 2.5x1019 electrons from an object will give it what charge?

8. An object has a charge of -7C. How many electrons were added to it?

9. Give the charges that result on each conducting sphere when they aretouched together.

a) +6C, +12Cb) -4C, -6Cc) +4C, 0Cd) +7C, -7C

10. Find the force (magnitude and direction) between two charges (9µC & 4µC) if they are separated by a distance of 1.5m in air.

11. If the following changes were made to the scenario in the previous problem, describe how the force would be affected:

a) one of the charges is doubled.

b) the distance between the charges is tripled.

c) one charge is doubled, the other is tripled, and the distance is halved.