Posted by **simin** on Thursday, February 9, 2012 at 8:53pm.

Two identical small spheres possessing charges q1 and q2 are separated by distance r. Which change would produce the greatest increase in the magnitude of the electrostatic force that one sphere exerts on the other?

1) doubling charge q1

2) doubling r

3) doubling r and charge q1

4) doubling r and charges q1 and q2

the answer is 1 but why?

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