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Listrik StatisFisika XII
17).
W = ¹/₂.C.V²
W = ¹/₂ x 20 x 4 x 10⁶
W = 4 x 10⁷ joule
18).
Dari rumus V = kq/r² menjadi perbandingan
V' / V = [q'/q] . [r/r']
V' / 300 = [2q / q] . [r / 0,25r]
V' = 300 x 2 x 4
V' = 2.400 volt