A) \[\text{1}{{\text{0}}^{-4}}\]poise
B) \[\text{1}\times \text{1}{{\text{0}}^{-3}}\]poise
C) \[8.6\times \text{1}{{\text{0}}^{-3}}\]poise
D) \[1.02\times \text{1}{{\text{0}}^{-3}}\]poise
Correct Answer: B
Solution :
We have,\[6\pi \eta rv=\frac{4}{3}\pi {{r}^{3}}\rho g-\frac{4}{3}\pi {{r}^{3}}\sigma g\] where\[\rho \to {{\rho }_{water}}\]and\[\sigma \to {{\rho }_{air}}\] \[\Rightarrow \]\[\eta =\frac{2g{{r}^{2}}(\rho -\sigma )}{9v}\] \[=\frac{2\times 9.81\times {{(0.2\times {{10}^{-2}})}^{2}}\times 999}{9\times 8.7}\] \[=1\times {{10}^{-3}}\]poiseYou need to login to perform this action.
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