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r² = q1q2k/F
r² = (4 x 9 x 9 x 10^9 x 10^-6 x 10^-6)/3.240
r² = (324 x 10-³)/3.240
r² = 10-³/10
r² = 10-⁴ m
r = 10-² m
R^2= kQ1Q2/F
R=10^-2m = 1 cm