b) The force is 1/9 as great.
The force between two charged objects is inversely proportional to the square of the distance between them. This means that if the distance between them triples, the force between them will decrease by a factor of 9 (3 squared). Therefore, the force is 1/9 as great.
Imagine two equally charged objects that are hanging a certain distance from one another. How does the force between them change if the distance between them triples?
a
The force becomes 9x's greater
b
The force is 1/9 as great
c
The force is 1/3 as great
d
The force becomes 3x's greater
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