Coulomb's law: doubling the distance
If the distance between two point charges is doubled, the electrostatic force between them becomes:
Answer A: explanation for every choice
A
Correct. F ∝ 1/r², so doubling r divides the force by 4.
B
This treats the force as proportional to 1/r.
C
Force decreases with distance.
D
This is the change if distance were halved.
TakeawayCoulomb's law: F ∝ q₁q₂/r².
Equation usedCoulomb's law and electric field
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