alleryThe value of k in Coulomb's law (in SI) is approximately:
A9 × 10⁹ N·m²/C²
B8.85 × 10⁻¹² C²/Nm²
C1.6 × 10⁻¹⁹ C
D1 N/C
Answer & Solution
Correct answer: A. 9 × 10⁹ N·m²/C²
k = 1/(4πε₀) ≈ 9 × 10⁹ N·m²/C².
ε₀ = 8.85 × 10⁻¹² C²/Nm² is the permittivity of vacuum.
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