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F = k.Q1.Q2/r²
27000 = 9.10⁹.3.10⁻⁶.64.10⁻⁴/r²
r² = 9.10⁹.3.10⁻⁶.64.10⁻⁴/27000
r² = 64.10⁻⁴
r = √64.10⁻⁴
= 8.10⁻² m = 8 cm