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Two charges repel each other r with a force of 10^ -6N when they are 10 cm apart. When they are brought closer together until they are 2 cm aprt, the force between them becomes:
A. 4 x 10^-8 N
B. 5 x 10^-6 N
C. 8 x 10^-6 N
D. 2.5 x10^5 N
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