F = k*q1*q2/r^2, при r = 3*10^4 м F = 9*10^9*20*30/9*10^8 = 6000 H = 6 кН
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F = k*q1*q2/r^2, при r = 3*10^4 м
F = 9*10^9*20*30/9*10^8 = 6000 H = 6 кН