A plastic ball with a charge of +1.0 C is brought near another ball with a charge of -2.0 C. The balls are let go so that they are free to move. What happens?

a. The balls move apart because they exert equal repulsive forces on each other.

b. Nothing. Both balls stay exactly where they are.

c. The negatively charged ball does not move, but the positively charged ball starts
to move toward it because of an attractive force.

d. The balls both start moving toward each other because they exert equal
attractive forces on each other.