Day 24

This class period will be asynchonous. You don't have to join a discussion today. The homework is due at the end of our normal class period: 12:15. It is Class Review Homework Set #3, a quiz on Canvas. Here are the questions:

1. Explain what happens at the molecular level when a positive rod is placed near (but doesn't touch) a pith ball.

2. Explain, at the molecular level, what happens to the leaves of an electroscope when a negative rod is placed near (but doesn't touch) the top of an electroscope.

3. Explain, at the molecular level, what happens to the leaves of an electroscope when a negative rod touches the top of an electroscope.

4. When a balloon gets really "charged up" it is observed that small hairs on the balloon stand on end, getting as far away from each other as possible. Explain this observation.

5. What are the three premises that we use when trying to explain charge interactions?

6. How are charges produced?

7. Write a sound conditional argument with the following conclusion: The ring floats above the rod.

8. How are temporary dipoles formed? Why is it temporary?