# NSCI 100 NSCI100 Pre-Quiz 2 with Answers (UMUC)

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NSCI 100 NSCI100  Pre-Quiz 2

1. The nucleus of an atom is charged
2. If you strip electrons from an atom, the atom becomes a
3. A difference between electric and gravitational forces is that electric forces include
4. To say that an object is electrically polarized is to say
5. A water molecule is electrically
6. The electric force on a 2-C charge is 60 N. How great is the electric field at the charge location?
7. The electric field around an isolated electron has a certain strength 1 cm from the electron. The electric field strength 2 cm from the electron is
8. If you do 10 J of work to push a charge into an electric field and then release the charge, as it flies past its starting position, its kinetic energy is
9. Normally a balloon charged to several thousand volts has a relatively small amount of
10. Which is more dangerous, touching a faulty 120-V light fixture, or a Van de Graaff generator charged to 100,000 V?
11. An electron is pushed into an electric field where it acquires a 1-V electric potential. If two electrons are pushed the same distance into the same electric field, the electric potential of both electrons is
12. A sustained electric current can be achieved with a
13. The purpose of a voltage source is to provide an electrical
14. A sustained flow of electric charge requires
15. The electric charge on a current-carrying wire is normally
16. A coulomb of charge passing through a 6-V battery supplies
17. When you purchase a water pipe in a hardware store, water is not included. When you purchase copper wire, electrons
18. The electric resistance of a superconductor is
19. When a steady voltage is across one-half as much resistance, the current
20. The current through two identical light bulbs connected in series is 0.25 A. The voltage across both bulbs is 110 V. The resistance of a single light bulb is
21. Compared to a single lamp connected to a battery, two lamps connected in parallel to the same battery will draw
22. As more lamps are put into a parallel circuit, the overall current in the power source
23. A heater uses 20 A when used in a 110-V line. If electric power costs 10 cents per kilowatt hour, the cost of operating the heater for 10 hours is
24. A power line with a resistance of 2 ohms draws a current of 80 A. The power dissipated in the line is
25. Break a bar magnet in half and each half is
26. Magnet A has twice the magnetic field strength of magnet B and pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
27. The source of all magnetism is
28. Every spinning electron is
29. A magnet will become weaker if it is
30. A bar magnet that holds a chain of nails illustrates
31. The magnetic field lines about a current-carrying wire form
32. When the current in a wire is reversed, the direction of the surrounding magnetic field
33. The minimum magnetic force on a moving electron occurs for motion
34. A magnetic force acts most strongly on a current carrying wire when it
35. Thrust a magnet into a coil of wire and you'll induce
36. Changing the magnetic field intensity in a closed loop of wires induces
37. Compared to a motor, a generator is
38. Voltage produced by a generator alternates because
39. The energy source for a generator may be
40. A transformer requires
41. The voltage across the input terminals of a transformer is 110 V. The primary coil has 50 loops and the secondary has 25 loops. The output is
42. A transformer for a laptop computer converts a 120-V input to a 24-V output. Compared with the number of turns on the primary coil, the secondary has
43. A current of 4 A exist in the primary coil of a transformer. The voltage across the primary coil is 110 V. What is the power output of the secondary coil?
44. An ideal transformer has 50 turns in the primary and 500 turns in the secondary. An input of 12 V

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