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q₁=q₂=1mC=10⁻³C
r=0,1cm=10⁻³m
k≈9*10⁹(N*m²)/C²
q₁*q₂=(10⁻³)²=10⁻⁶[C]
r²=(10⁻³)²=10⁻⁶[m²]
F=9*10⁹[(N*m²)/C²]*10⁻⁶[C²]*(1/10⁻⁶)[m²]=9*10⁹N