Questions

1.

How, in terms of electric charges, is ``static cling'' explained?

2.

If an electric field exists to the right, in which direction would a positive charge move if placed in that field?

3.

For an Ohmic material, decreasing the potential difference applied across it will cause the current to do what?

4.

If electricity costs $0.10 perl kilowatt-hour, how much would it cost to run a 1000 Watt heater for 10 hours?

5.

What is one way that electric charge and magnetic ``charge'' are similar? What is one way that they differ?

6.

What fundamental property of electricity and magnetism is behind the operation of the following devices:

• electric motor
• speaker
• electric generator
• microphone
• magnetic tape recorder
• magnetic tape reader

7.

Why, in an electromagnet, is a ferromagnetic core often found?

8.

What is one basic electric and one basic magnetic property of a superconductor?