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5) F=k*q1*q2/R^2   R=sqrt(k*q1*q2/F)=sqrt(9*10^9*2*10^-9*3*10^-9/9*10^-3)=2,45*10^-3 м

6) A=q*U    U=A/q=0,6/12*10^-3=50 B

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