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Downward force on water drop = mass * acceleration due to gravity

let the electric field strength be applied vertically upwards to oppose gravity.

electric force = charge * electric field strength
     0.0000001 kg * 9.81 m/s²  =  1.6 * 10⁻¹⁹ C * E
         E = 6.13 * 10¹²  Newton/Coul