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F / F' = (kq₁q₂ / r²) / (kq₁'q₂' / r'²)
F / F' = q₁q₂ / (q₁'q₂') (r' / r)²
2 N / F' = q₁q₂ / (2q₁ 2q₂) / (1/2 r / r)²
2 N / F' = 1 / 16
F' = 32 N