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dane q=2*10^(-10)C, F=10N, k=9*10^9Nm2/kg2,
szukane r
F = k*q2/r2
r2 = k*q2/F = 9*10^9Nm2/C2*4*10^(-20)C2 / 10N = 36*10^(-12)m2
r = 6*10^(-6)m = 6 mikrometrów.
.................pozdrawiam