An air bubble of negligible weight having radius r rises steadily through a solution of density $\sigma$ at speed v. The coefficient of viscosity of the solution is given by :

Question

$\eta = {{4r\sigma g} \over {9v}}$

$\eta = {{2{r^2}\sigma g} \over {9v}}$

$\eta = {{2\pi {r^2}\sigma g} \over {9v}}$

$\eta = {{2{r^2}\sigma g} \over {3\pi v}}$

Solution

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