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A small metal ball of diameter 4 mm and ...

A small metal ball of diameter `4 mm` and density `10.5 g//cm^(3)` in dropped in glycerine of density `1.5 g//cm^(3)`. The ball attains a terminal velocity of `8//cm s^(-1)`. The coefficient of viscosity of glycerine is

A

`4.9` poise

B

`9.8` poise

C

`98` poise

D

`980` poise

Text Solution

Verified by Experts

The correct Answer is:
B
`v_(0)=2/9(r^(2)(rho-rho')g)/(eta)` or `eta=(2r^(2)(rho-rho')g)/(9v_(0))`
`=(2xx0.2xx0.2xx9xx980)/(9xx8)` poise `= 9.8poise`
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