alleryCoulomb's law gives the force between two point charges q₁ and q₂ separated by distance r in vacuum as
AF = k q₁ q₂ / r²
BF = k q₁ q₂ / r
CF = k q₁ q₂ × r
DF = k q₁ q₂ × r²
Answer & Solution
Correct answer: A. F = k q₁ q₂ / r²
1. Coulomb's law is the fundamental inverse-square law for electric force.
2. F = k q₁ q₂ / r² where k = 1/(4πε₀) ≈ 9 × 10⁹ N m² C⁻².
3. The force is attractive for opposite charges, repulsive for like.
4. It acts along the line joining the two charges.
_Source: syllabus Physics, Ch 1 "Electric Charges and Fields", §1.5_
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