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q2=40mC=40*10^-3 C
r=2mm=2*10^-3 m
k=9*10^9 N*m²/C²
F=?
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F=k*q1*q2/r²
F=9*10^9 * 50*10^-3 * 40*10*-3 / (2*10^-3)²=4,5*10^12 N=4,5TN teraniutonów
[(N*m²/C²)*C²/m²=N]