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 rod attract repel proton(s) electron(s) neutron(s)

Faraday Cage grounding

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 are touched together.a) +6C, +12C b) -4C, -6C c) +4C, 0C d) +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.