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q1=q2= 4C
F= 9x10^9 N
ditanya
r=...?
jawab
F= k. q1.q2 / r²
9x10^9= 9x10^9 . (4)(4) / r² <<< 9 nya dicoret 9/9=1
1 = 16 / r² <<< r² pindah ruas kekiri jadi perkalian
r² = 16
r = √16
r = 4 m