The terminal velocity of a copper ball of radius $5\,mm$ falling through a tank of oil at room temperature is $10\,cm\,s ^{-1}$. If the viscosity of oil at room temperature is $0.9\,kg\,m ^{-1} s ^{-1}$, the viscous drag force is :
The terminal velocity of a copper ball of radius $5\,mm$ falling through a tank of oil at room temperature is $10\,cm\,s ^{-1}$. If the viscosity of oil at room temperature is $0.9\,kg\,m ^{-1} s ^{-1}$, the viscous drag force is :
- [NEET 2022]
- A
$8.48 \times 10^{-3}\,N$
- B
$8.48 \times 10^{-5}\,N$
- C
$4.23 \times 10^{-3}\,N$
- D
$4.23 \times 10^{-6}\,N$
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