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q1=20 C
q2=40 C
r=20cm=20×10^-2
k=9×10^9
dit:F=...?
jwb:
F=k.q1.q2/r²
=9×10^9.20.40/(20×10^-2)²
=9.20.40.10^9/400×10^-4
=7.200.10^9/400×10^-4
=18×10¹³ N
4. A positif
B negatif
C negatif
D positif