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q1 = 2 C
q2 = 6 C
r = 3 mm = 3/10^3 = 3 × 10^-3 m
ditanya : F
jawab :
F = k × q1 × q2/r^2
= 9 × 10^9 × 2 × 6/(3 × 10^-3)^2
= 9 × 12 × 10^9/9 × 10^-6
= 12 × 10^9 × 10^6
= 12 × 10^(9 + 6)
= 12 × 10^15
atau
= 1,2 × 10^14