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An oil drop of radiuss 2mm with density ...

An oil drop of radiuss `2mm` with density `3(g/(cm^3))` is held stationary under a constant `vec(E) = 3.35 xx 10^5 V/m` in the milikan's drop experiment. What is number of excess electron that oil drop will possess `(g=9.81)m/s^2`

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The correct Answer is:
`N=61.60 x 10^14`
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