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An air bubble of diameter 2mm rises stea...

An air bubble of diameter `2mm` rises steadily through a solution of density `1750kgm^(-3)` at the rate of `0.35cms^(-1)` .Calculate the coefficient of viscosity of the solution (in `Pascal times Sec`).The density of air is negligible. `(g=9.8m/s^(2))`

A

9 poise

B

6 poise

C

11 poise

D

4 poise

Text Solution

Verified by Experts

Buoyant force on a bubble (B) ` = 4/3 pir^(3) sigma g uArr`
Viscous force (F) ` = 6 pi eta rv uArr`
For uniform velocity F = B
Equating both , we get ` eta = (2r^(2) sigma g)/(gv)`
Putting values `eta = 11 ` poise
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