If the distance between two point charges is tripled while the size of the charges remains the same, the force between the charges is multiplied by
A. 9
B. 3
C. 1/3
D. 1/9.
D. 1/9.
Since the distance increases, the force decreases. Since F is inversely proportional to r2, then it decreases by a factor of 32 or 9.
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