Worksheet Coulomb's Law: Some Practice with Proportions
Refer to the following information for the next ten questions.

Two charges, a +5 µC charge and a -6 µC charge, are 2 meters apart.
 1. What is the magnitude of the original electrostatic force between them?

 2. Is it an attractive or repulsive force?

 3. What conditions could alter the nature of the force; that is whether it is attractive or repulsive?

 4. How would the original force change if the charges were moved twice as far apart?

 5. How would the original force change if the charges were moved towards each other to a final distance which equals half of their original separation?

 6. How would the original force change if the charges were each doubled in size?

 7. How would the original force change if each of the charges were to be cut in half?

 8. How would the original force change if the charges were each doubled in size as well being moved to a distance that is twice their original separation?

9. Which of the following combinations of changes, involving both a change in the magnitude of the charges as well as their separation, could produce a force that is 64 times stronger than the original force between them?

10. Which of the following combinations of changes, involving both a change in the magnitude of the charges as well as their separation, could produce a force that is only 1/24th of the original force between them?