F=k*q1*q2/R^2
R=sqrt(k*q1*q2/F)=sqrt(9*10^9*2*10^-9*5*10^-9/9*10^-3)=0,01 м
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F=k*q1*q2/R^2
R=sqrt(k*q1*q2/F)=sqrt(9*10^9*2*10^-9*5*10^-9/9*10^-3)=0,01 м