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Pada keadaan setimbang, gaya berat tetes minyak (w = mg, arah ke bawah) sama dengan gaya elektrostatik (F = q E, arah ke atas)
F = w
n q E = m g
E = m g / (n q)
E = 5×10⁻¹⁵ · 9,8 / (5 · 1,6×10⁻¹⁹)
E = 61250 N/C ← jwb