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A spherical oil droplet with nine excess electrons is held stationary in an electric field between two large horizontal plates that are 2.25 centimeter apart. The field is produced by maintaining a potential difference of 0.3375 kV across the plates, and the density of the oil is 824 kg/m3. Determine what is the radius of the oil drop? (e = 1.60 x 10-19 C).

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