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An oil drop of 12 excess electrons is he...

An oil drop of 12 excess electrons is held stationary under a constant electric field of `2.55xx10^(4)NC^(-1)` in Millikan's oil drop experiment. The density of the oil is `1.26xx10^(3)kgm^(-3)`. Estimate the radius of the drop `(g=9.81ms^(-2),e=1.60xx10^(-19)C)`.

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