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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 `2.55 xx 104 NC^(–1)` (Millikan’s oil drop experiment). The density of the oil is `1.26 g cm^(–3)`. Estimate the radius of the drop. `(g = 9.81 m s^(–2), e = 1.60 xx 10^(–19) C)`.

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