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⇔ r² = k. Q₁.Q₂ / F
= 9 x 10⁹.4 x 4 / 9 x 10⁹
= 4 x 4
r² = 16
r = √16
r = 4 m
semoga membantu
9×10^9 = 9×10^9 • 4 • 4 / r²
r² = 4 • 4
R = 4 m ← jwb