I need assistance with a homework assignment regarding electrostatics:

I need to write what happens when:

1. A charged rod is held near the top of a soda can that is placed on top of an electroscope.

2. A charged rod is held near the top of a soda bottle that is placed on top of an electroscope.

3. The soda can is removed from the top of a charged electroscope.

4. The soda bottle is removed from the top of a charged electroscope.

5. A charged rod is held near a suspended soda can.

6. A charged rod is held near a suspended soda bottle.

7. A charged rod is held near a soda can placed on its side.

8. A charged rod is held near a soda bottle placed on its side.

9. What is a rule that governs all the above?

Any suggestions?