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q₂ = 3C
F = 81 x 10⁷ N
F = k. q₁q₂
r²
81 x 10 ⁷ = 9 x 10⁹ x 3 x 3
r²
r² = 81 x 10⁹
81 x 10⁷
r² = 1 x 10⁻²
r = 10⁻¹
= 0.1 m