3. hello please help thank you.

Use the following information to answer the next question Charles Augustin de Coulomb performed a series of investigations on the quantitative nature of electrical forces. He was able to determine the effect of both distance and magnitude of charge on the electrostatic force between two charged metal spheres, 3. Coulomb started with two Identically charged spheres separated by a distance r. The force between the spheres was F. If he changed the separation to or, then the force between the spheres would have become -F