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r=10cm=0,1m
k=9*10*9 N*m²/C²
F=?
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prawo Coulomba
F=k*q1*q2/r²=k*q²/r²
F=9*10^9 * (5*10^-5)²/0,1²=2250 N=2,25 kN
[(N*m²/C²)*C²/m²=N]