A Spherical Oil Droplet with Nine Excess Electrons Is Held $2.25 \mathrm {~cm}$

A spherical oil droplet with nine excess electrons is held stationary in an electric field between two large horizontal plates that are $2.25 \mathrm {~cm}$ apart. The field is produced by maintaining a potential difference of $0.3375 \mathrm { kV }$ across the plates, and the density of the oil is $824 \mathrm {~kg} / \mathrm { m } ^ { 3 }$ . What is the radius of the oil drop? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } \right)$

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