Shown in the figure is a container whose top and bottom diameters are D and d respectively At the bottom of the container these is a cappillary tube of outer radius b and inner radius a. the volume flow rate in the capillary is Q. if the capillary is removed the liquid comes out with a velocity of `v_(0)`. The density of the liquid is given as calculate the coefficient of viscosity `eta` (given `pia^(2)=10^(-6)m^(2)` and `(a^(2))/(l)=2xx10^(-6)m`]

Answer

`eta=(pi)/(8Ql)xx(1)/(2)rhov_(0)^(2)[1-((A_(2))/(A_(1)))^(2)]xxa^(4)` (where `(A_(2))/(A_(1))=(b^(2))/(D^(2))`