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Two 1 C charges are placed 1 m apart in vacuum. What force acts between them?
A9 x 10^9 N
B9 x 10^-9 N
C1.0 x 10^3 N
D8.85 x 10^-12 N
Answer & Solution
Correct answer: A. 9 x 10^9 N
F = k q1 q2 / r^2 = 9 x 10^9 x 1 x 1 / 1 = 9 x 10^9 N, which shows 1 C is a very large unit.
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