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Question: An oil drop of 10 excess electrons is held stationary under a constant electric field of \(3.65 \tim...

An oil drop of 10 excess electrons is held stationary under a constant electric field of 3.65×104NC−13.65 \times 10^{4}NC^{- 1}in millikan’s oil drop experiment. The density of oil is 1.26gcm−31.26gcm^{- 3}Radius of the oil drop is (Take, g = 9.8 ms−2ms^{- 2}e = 1.6×10−1910^{- 19}C)

A

1.1×10−6m1.1 \times 10^{- 6}m

B

4.8×10−5m4.8 \times 10^{- 5}m

C

4.8×10−18m4.8 \times 10^{- 18}m

D

1.13×10−18m1.13 \times 10^{- 18}m

Answer

4.8×10−5m4.8 \times 10^{- 5}m