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q1=2µC=2*10^-6 C
q2=5µC=5*10^-6 C
r=10cm=0,1m
k=9*10^9 N*m²/C²
F=?
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F=k*q1*q2/r²=9*10^9 * 2*10^-6 * 5*10^-6/ 0,1²=9N
[(N*m²/C²)*C*C/m²=N]
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2)
F=810N
r=0,4m
q1=q2=q=?
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F=k*q1*q2/r²=k*q²/r²
k*q²=F*r²
q²=F*r²/k
q=√(F*r²/k)
q=√[(810 * 0,4² / (9*10^9)]=1,2*10^-4 C=0,12mC mili