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q2= -8 C
r= 3cm = 0.03 m atau 3x10^-2
k=9x10^9 Nm^2/C^2
Dit: F........?
Jwb:
F= K.Q1.Q2
-------------
r^2
= 9x10^9x6x-8
--------------------
(3x10^-2)^2
= 9x10^9x6x-8
--------------------
9x10^-4
= 4,8 X 10^13 N
ket. ^2= pangkat 2