F=k*q^2/R^2
q=sqrt(F*R^2/k)=sqrt(9*10^-5*10^-2/9*10^9)=10^-8 Кл
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F=k*q^2/R^2
q=sqrt(F*R^2/k)=sqrt(9*10^-5*10^-2/9*10^9)=10^-8 Кл