F = k*q1*q2/r^2
r^2 = k*q1*q2/F = 9*10^9*225*10^-18/9 = 225*10^/9 m^2
r = 15* 10^-3 m = 15 mm udachi))
F = k*q1*q2/r^2
r^2 = k*q1*q2/F = 9*10^9*225*10^-18/9 = 225*10^/9 m^2
r = 15* 10^-3 m = 15 mm udachi))