1. Which of the following are true of static charges? (Circle all that are true.)
2. The charge of one electron is -1.6 X 10-19 Coulombs. If a neutral object loses 1.5x106 electrons, then what will be its charge?
3. A negatively-charged balloon is held above (without touching) a neutral electroscope. The presence of the nearby balloon causes the needle of the electroscope to deflect.
a. Draw the charges on "induced" or "polarized" neutral electroscope below.
b. Explain how the balloon has induced the temporary charge upon the electroscope.
Consider the negatively charged electroscope at the right for review questions #4 and #5.
4. If a negatively charged plate is brought near the top of the electroscope, the deflected straw will:
5. If a positively charged plate is brought near the top of the electroscope, the deflected straw will:
6. The outer electrons in metals are not tightly bound to the atomic nuclei. They are free to roam in the material. These materials are good
For questions #7 and #8, consider the following situation. Connor Duct (Con to his friends) takes a positively charged metal rod and touches a metal sphere on an insulated stand as shown below. Draw the direction of electron flow.
7. Electrons will flow until the two objects have equal ____.
8. The charge on the metal sphere will end up ___.
9. If an electroscope, charged up with excess negative charge, is touched and grounded, then it will end up with ___ charge.
10. What will be the charge of the following sphere in step e if steps a - d are followed?
Explain how the object acquires this charge.
11. Charge carriers in a metal are electrons rather than protons because electrons are __________.
12. Two like charges ________.
13. When the distance between two charges is halved, the electrical force between the charges _____.
14. If you comb your hair and the comb becomes positively charged, then your hair becomes _______.
15. A negatively charged rod is brought near a metal can that rests on a wood table. You touch the opposite side of the can momentarily with your finger. The can is then _______.
16. Two charges have a force of -55 Newtons. The force is ___.
17. A charge feels a force of 0.50 Newtons when it is 1 meter away from a Van de Graff Generator. The force will be ___ Newtons when the charge is moved 2 meters.
18. Two charges are 0.40 meters apart. One charge is 1.0 X 10-10 C. The other is 3.0 x 10-9 Coulombs. The force between these two charges is ___ Newtons.
19. If the both of the above charges are doubled, while the distance is doubled, by what factor will the force change?
20. Two charges separated by one meter exert a one N force on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be _________.
21. Two charges separated by one meter exert a one N force on each other. If the charges are pulled to 3 m separation distance, the force on each charge will be ________.
22. A charge of 0.30 Coulombs has a potential energy of 400 Joules has an electric potential (i.e., voltage) of ___ Volts.
23. If a Van de Graff Generator has an electric potential (i.e., a voltage) of 600 Volts and a charge of 0.000001 Coulombs. What is the PE of the charge?
24. If you were to grab onto a single wire (suspended above the ground by the wire only) that was at a potential of 1000 Volts,
25. In the water analogy, current is like
26. In an electrical circuit, electrons come from _____________.
27. The source of electrons lighting an incandescent light bulb is ________.
28. In a common circuit, electrons move at speeds of ____________.
29. The number of electrons delivered to an average American home by an average power utility in 1984 was ______________
30. Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the ____________.
31. Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The voltage in greatest across the lamp with the _____________.
32. Two lamps, one with a thick filament and one with a thin filament, are connected in parallel to a battery. The current is largest in the lamp with the _____________.
33. Two lamps, one with a thick filament and one with a thin filament are connected in series to a battery. The voltage is greater across the lamp with the ____________.
34. As more lamps are put into a series circuit, the overall current in the circuit _____________.
35. As more lamps are put into a parallel circuit, the overall current in the circuit ____________.
36. A 60 W light bulb and a 100 W light bulb are each rated at 120 V. Which light bulb has a larger resistance?
37. A heater uses 20 A when used in a 110 V line. If electric power costs 10 cents per kilowatt hour, the cost of running the heater for 10 hours is ___________.
Consider the following light bulb for questions #38 and #39. A light bulb has 144-ohm when it is placed across a 120 V potential difference.
38. The current going through the light bulb is ___ Amps.
39. The power rating of the bulb is ___ Watts.
40. A circuit has a current of 2.0 Amps. How many Coulombs of charge pass through the circuit in 3.0 seconds?
41. Find the voltage, current, and resistance where it is needed below.
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This page last updated on March 2, 1998.