Two point charges of 2.0 μC and 3.0 μC are 0.30 m apart in air. What is the force between them (k = 9.0 × 10⁹ N m² C⁻²)?
Correct answer B. 0.60 N
Explanation
F = kq₁q₂/r² = 9.0 × 10⁹ × 2.0 × 10⁻⁶ × 3.0 × 10⁻⁶ / 0.30² = 0.60 N. Not squaring the distance gives 0.18 N.
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