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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 1.26 g `cm^(-3)`. Estimate the radius of the drop, `(g=9.81 ms^(-2), e=1.60xx10^(-19) C)`.

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(a) zero ,(b) zero (c ) 1.9 N/C
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