Two long bar magnets are aligned so that north poles face each other. The magnets are separated by 1 cm, and a repulsive force between the north poles is 0.04 N. When the separation is increased to 2 cm the force will be
A. 0.020 N.
B. 0.050 N.
C. 0.40 N.
D. 0.025 N.
E. 0.010 N.
Answer: E
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