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F=k*q1*q2/r²
F1=k*q1*q2/4²=k*q1*q2/16
F2=k*q1*q2/2²=k*q1*q2/4
F2/F1=[k*q1*q2/4]/[k*q1*q2/16]=[k*q1*q2/4]*[16/(k*q1*q2)]=4
F2/F1=4
F2=F1*4=200N*4=800N