risultati:
d=1.56*10m
F=1.1*10^-7N
In aria
F = Ko*Q1*Q2/d^2
d = √9*10^9*4,82^2*10^-14/(8,54*10^-6) = 15,65 m
In acqua
εr = 80
F' = ko/εr*Q^2/d^2
F' = 9,0*10^9/80*4,82^2*10^-14/15,65^2 = 1,067*10^-7 N
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