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An oil drop of radius 2 mm with density 3 gcm−3 is held stationary under a constant electric field 3.55×105Vm−1  in the Millikan’s oil experiment. What is the number of excess electrons that the oil drop will possess? Consider g=9.81  m/s2

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a

1.73×1010

b

4.8×1011

c

17.3×1010

d

17.3×1012

answer is A.

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Detailed Solution

Electric force is balanced by gravitational force. FE = FG                ⇒ neE=mg ⇒n=mgeE=ρV×geE=3000×43π2×10-33×9.811.6×10-19×3.55×105 ⇒n=1.73×1010
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An oil drop of radius 2 mm with density 3 gcm−3 is held stationary under a constant electric field 3.55×105Vm−1  in the Millikan’s oil experiment. What is the number of excess electrons that the oil drop will possess? Consider g=9.81  m/s2