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Verified answer
Dik: Q=7 mikro Coulomb=7.10^-6 Cq=4 mikro Coulomb=4.10^-6 C
F=30 N,k=9.10^9 Nm²/C²
Dit: r
Jwb: F=k.Q.q/r²
30=9.10^9.7.10^-6.4.10^-6/r²
30=252.10^-3/r²
r²=252.10^-3/30
r²=8,4.10^-3
r=√(8,4.10^-3)m