Fisika kelas 12Mapel : Listrik statis

Semoga membantu. semangatttt

Fca = Fcb
(k x qc x qa)/rca² = (k x qc x qb)/rcb²
(k x 6 x 4)/r² = (k x 6 x 16)/(1 – r)² ( dibagi 6k)
4/r² = 16/(1-r)²
(2/r)² = (4/(1-r))²
2(1-r) = 4r
2 – 2r = 4r
-2r -4r = -2
-6r = -2
r = -2/-6
r = ⅓ meter
jawaban : B