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An oil drop falls through air with a terminal velocity of $5 \times 10^{- 4} m s^{- 1}$ ,viscosity of oil is $1.8 \times 10^{- 5} N s m^{- 2}$ and density of oil is $900 k g m^{- 3}$ ,Neglecting density of air as compared to that of the oil, select the correct option(s)

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radius of the drop is $6.2 \times 10^{- 2} m$

radius of the drop is $2.14 \times 10^{- 6} m$

terminal velocity of the drop at half of this radius is $1.25 \times 10^{- 4} m s^{- 1}$

terminal velocity of the drop al half of this radius is $2.5 \times 10^{- 4} m s^{- 1}$

answer is B, C.

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Weight = Viscous force $v_{t} \propto r^{2}$

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