F=kq1 q2/ r^{2}
F= 9*10^9 *4*10^-9*25*10^-9 /4=2,25*10^-7
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F=kq1 q2/ r^{2}
F= 9*10^9 *4*10^-9*25*10^-9 /4=2,25*10^-7