1. Revisit Coulomb's law - make sure you understand it, and what "inverse square" law means.
2. Work this problem: Two charges (4 x 10^-9 C, and 9 x 10^-9 C) are separated by a distance of 0.01 m.
a. What is the force between these charges?
b. Is this force attractive or repulsive? Why?
c. Without exactly calculating it, what would happen to the force if the distance between the charges was tripled?
d. What would happen to the force if the distance was cut to half the original value? Try to determine this without calculating.
3. How many electrons are in -1 C of charge? How about in -6 C?
4. Look up electric fields and try to understand: what they are, and how to draw them.
Let's have a quiz next Wednesday on everything up to and including this Thursday's class.
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