Answer
The force is proportional to 1 over the distance squared. F ~$ \frac{1}{d^{2}}$.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 9 - Think and Explain - Page 179-180: 55
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