Download Chapter 16: Electric Forces and Fields (48 pts) Name Read Chapter

Chapter 16: Electric Forces and Fields (48 pts)
Name _______________________
Read Chapter 16 pages 558 -580. Answer the following question using your book and your notes.
1) What part of an atom is positively charged and what part is negatively charged? (2 pts)
2) How does the charge of one electron compare to the charge of another electron?
3) How do the numbers of protons in the atomic nucleus normally compare to the number of electrons that orbit
the nucleus?
4) Explain from an atomic viewpoint why charge is transferred by electrons.
5) What is meant by saying that charge is conserved?
6) What did Millikan’s oil drop experiment reveal about the nature of electric charge?
7) What is the magnitude of the electric force between an electron and a proton that are separated by a distance
of 5.6 x 10-10 m? (2 pts)
8) Is the above electric force attractive or repulsive?
9) How does the magnitude of an electric force between two objects change when the objects are moved twice as
far apart? Three times as far apart? (2 pts)
10) The gravitational force is always attractive, while the electric force is both attractive and repulsive. What
accounts for this difference? (2 pts)
11) Which is stronger, the electrical force between an electron and a proton or the gravitational force between
these particles? Is the difference between these forces large or small? (2 pts)
12) What is the law of charged objects? (2 pts)
13) How are conductors different from insulators? Give an example of each. (3 pts)
14) What is a transistor and what is its function? (2 pts)
15) Give an example of something charged by friction.
16) Look at your triboelectric series chart. What would be the charge on both objects if you rubbed a rubber rod
with fur? (2 pts)
17) Describe charging by conduction.
18) How does an electrically polarized object differ from an electrically charged object? (2 pts)
19) What is normally the net charge of a polarized object?
20) A balloon is negatively charged by rubbing it on a wool sweater and then clings to a wall. Does this mean that
the wall is positively charge? Explain your answer. (2 pts)
21) Because of higher moisture content, air is a better conductor of charge in the summer than in the winter. Would
you expect the shocks from static electricity to be more severe in the summer of winter? Explain. (2 pts)
22) What occurs when we “ground” an object?
23) In charging by induction, what does bringing charged objects close to a neutral object do to the neutral object?
24) What has happened to the neutral object when the charging by induction process is done?
25) Name two examples of common force fields. (2 pts)
26) What is an electric field?
27) Draw the lines of force representing the electric field around an electron.
28) Draw the lines of force representing the electric field around a proton.
29) How is the direction of an electric field defined?
30) When electric field lines are being drawn, what determines the number of lines originating from the charge?
31) When electric field lines are being drawn, what determines the whether the lines originate from or terminal on
the charge?
32) Explain why you’re more likely to get a shock from static electricity by touching a metal object with your finger
instead of with your entire hand.
33) When touching a Van de Graff generator, why does your hair stand out? (2 pts)