1.25 An oil drop of 12 excess electrons is held stationary under a constant electric field of (Millikan’s oil drop experiment). The density of the oil is . Estimate the radius of the drop.
(g = 9.81 ; e = ).
Let the radius of the oil drop =r
Force (F) due to electric field E is equal to the weight of the oil drop (W).
The radius of the oil drop is 9.82 x mm.
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