Two equal charges repel one another with a force of 4.0 × 10-4 N when they are 10 cm apart. (Coulomb's constant is k=9.0 × 109 N.m2/C2.) If they are moved until the separation is 5 cm, the repulsive force will be
A. 4.0 × 10-4 N.
B. 64 × 10-4 N.
C. 0.25 × 10-4 N.
D. 1.0 × 10-4 N.
E. 16 × 10-4 N.
Answer: E
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