1. Two point charges, A and B, are separated by 6 cm. The attractive force between them is 20 N. Find the force between them when they are separated instead by 12 cm.

2. The charges are brought back to their original 6 cm separation, but the magnitude of charge A is doubled. Find the force between them.

3. What would the force become if charge B is doubled as well?

4. The potential difference between a storm cloud and the ground is 100,000,000 V. If a charge of 2 C flashes in a bolt from the cloud to Earth, what is the change in the potential energy of the charge?

5. A butterfly at eye level is 20 cm in front of a plane mirror. You are behind the butterfly, 50 cm from the mirror. What is the distance between your eye and the image of the butterfly in the mirror?