r=5 см=0.05 м
F=20 мН=0.020 H
k=9*10^9
F=k*q^2 /r^2
q =√ (F*r^2/k)= r √(F/k)= 0.05√ (0.020 / 9*10^9 ) =74,5×10-9 = 74,5 нКл
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r=5 см=0.05 м
F=20 мН=0.020 H
k=9*10^9
F=k*q^2 /r^2
q =√ (F*r^2/k)= r √(F/k)= 0.05√ (0.020 / 9*10^9 ) =74,5×10-9 = 74,5 нКл