Posted by **Pat** on Monday, June 4, 2012 at 11:00pm.

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?

- PHYSICS -
**Elena**, Tuesday, June 5, 2012 at 3:25am
Coulomb's Law

F1=k•q1•q2/r²

F2=k•q1•q2/R²

If R=5r, then F2=F1/25

- PHYSICS -
**drwls**, Tuesday, June 5, 2012 at 3:30am
It's called an inverse square law.

Gravity of a point mass behaves the same way.

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