Question Detail
Question
How far apart are two charges, one of magnitude 3μC and the other of magnitude 5μC, if the force between them is 20N?
Correct Answer
Option A is the correct answer.
Detailed Explanation
From F = kq1q2/r², r = √(kq1q2/F) = √((8.99×10⁹)(3×10⁻⁶)(5×10⁻⁶)/20) ≈ 0.082m.
Hint
Rearrange Coulomb's law to solve for r, then plug in the given charges and force.