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k=1/4πεr^2
ε=εr*εodla próżni i powietrza εr=1; ε=εoεo=8,854*10^-12 F/m
k= 1/(4*π*8,895*10^-12)=8,95*10^9
F=kq1q2/r^2
q1=10 C; q2=20 C; r=5 km=5*10^3 m
F= 8,95*10^9*10*20/(5*10^3)^2=71 600
F=71600 N