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F=kq²/r² prawo Coulomba
F=9×10⁹Nm²/C²×(10⁻⁶C)²/(0,1m)²
F=9×10⁹×10⁻¹²/10⁻²
F=9×10⁻¹N=0,9N
r₁=20cm=0,2m
F=9×10⁹×10⁻¹²/(0,2)²
F=9×10⁻³/4×10⁻²
F=2,25×10⁻¹N=0,225N