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MCAT Question A Day - 2/22/14 - Answer!

What is the force between two 10μC charges separated by a distance of 10 cm?

A.  1.0 x 10-8 N
B.  90 N
C.  30 N
D.  -30 N

The correct answer is (B). The force of interaction between two charges is: F = kq1q2 / r2. Since the charges are alike, the force is repulsive (positive sign). This eliminates choice (D) immediately.

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