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F=400N
q1=2*10^-5 C
k=9*10^9 N*m²/C²
q2=?
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F=k*q1*q2/r²
k*q1*q2=F*r²
q2=F*r²/(k*q1)
q2=400 * (6*10^-7)²/(9*10^9 * 2*10^-5)=8*10^-16 C
{N*m²/[(N*m²/C²)*C]=C}