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Q.

An oil drop of 12 excess electrons is held stationary under a constant electric field of 2.55×104 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

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a

98.1×104m

b

9.81×103m

c

9.81×104mm

d

9.81×106mm

answer is C.

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Detailed Solution

qE=mgneE=43πr3ρgr3=3neE4πρg=3×12×1.6×1019×2.55×1044π×1.26×103×9.8=0.945×1018r=0.945×10183=0.981×106m=9.81×104mm

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