Tolong dong no.4 #thnks

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Tolong dong no.4 
#thnks

Tolong dong no.4
#thnks

Q1=4×10^-6 C
q2=3×10^-4 C
r=8cm=8×10^-2
k=9×10^9 Nm²/C²
jawab:
F= k· q1·q2:r²
=9×10^9 × (4×10^-6)×(3×10^-4):(8×10^-2)²
=9×10^9 × (12×10^-10):(64×10^-4)
=108×10^-1 : 64×10^-4
=1.6875 × 10^3
=1.687,5 N