Two very small spherical metal objects, each with 1 Coulomb of charge, are brought together in a vacuum so that the separation distance between their centers is 1 mm. What is the force of repulsion between the two objects? (Coulomb's constant is k=9.0 × 109 N.m2/C2.)
A. 9 × 1014 N
B. 9 × 1015 N
C. 9 × 1012 N
D. 9 × 1013 N
Answer: C
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