Asked by Pat

If you increase the distance between two identical point charges so that the new distance is five times the original distance, what happens to the force between them?

I know it is suppose to be divided by 25 but why?
Answered by Elena
Coulomb's Law

F1=k•q1•q2/r²
F2=k•q1•q2/R²
If R=5r, then F2=F1/25
Answered by drwls
It's called an inverse square law.
Gravity of a point mass behaves the same way.
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