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Electrostatics: Coulomb's Law MCQ

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Coulomb's LawMediumQuestion 31405

Question

Force between two charges is F. If each charge is doubled and distance tripled, new force is:
  1. A
    4F/9
    Correct
  2. B
    2F/3
  3. C
    8F/9
  4. D
    4F/3

Correct answer

4F/9

Explanation

F ∝ q₁q₂/r². New: (2q₁)(2q₂)/(3r)² = 4q₁q₂/(9r²) = 4F/9.

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