An air bubble of radius $r$ rises steadily through a liquid of density $\rho $ with velocity $v$ . The coefficient of viscosity of liquid is
An air bubble of radius $r$ rises steadily through a liquid of density $\rho $ with velocity $v$ . The coefficient of viscosity of liquid is
- A
$\frac{2}{9}\frac{{{r^2}\rho g}}{v}$
- B
$\frac{2}{9}\frac{{{r^2}g}}{{v\rho }}$
- C
$\frac{2}{9}\frac{{v\rho g}}{{{r^2}}}$
- D
$\frac{2}{9}\frac{{\rho g}}{{v{r^2}}}$
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