Posted by Adrian on Thursday, February 14, 2013 at 7:31pm.
Two identical point charges are separated by a distance of 3.0 cm and they repel each other with a force of 4 X 10^5 N. What is the new force if the distance between the point charges is doubled?

Physics  drwls, Thursday, February 14, 2013 at 7:51pm
An inverse square law applies tp both gravitational and electrostatic forces.
If you double the distance between two objects, the force is decreased by a factor of 1/2^2, which is 1/4
Multiply that by the original force and you get 1 x 10^5 N
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