posted by James .
Two small charged balls have a repulsive force of 0.20N when they are separated by a distance of 0.90m . The balls are moved closer together, until the repulsive force is 0.58N .
How far apart are they now?
Express your answer to two significant figures and include the appropriate units.
Now wait a minute, your questions are really all the same question. The only difference is arithmetic.
F = k Q1Q2 /r^2