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1. F=k.q1.q2/r²
=9.10^9.12.4/(0,4)²=2700×10^9=27×10¹¹
2.jarak=20cm=0,2m
F=K.q1.q2/r²
F×r²/q1×K=q2
18×4×10^-2
= --------------
10^-8×9×10^9
18×4×10-²
= ----------- = 8×10-³=0,008
9 ×10¹