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Which of the following expressions regarding the unit of coefficient of viscosity is not true?

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$dyn {cm}^{- 2} s$

$dyn {cm}^{2} s^{- 1}$

${Nm}^{- 2} s$

$1 poise = 10^{- 1} {Nm}^{- 2} s$

answer is D.

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Detailed Solution

All four choices are unsatisfactory.
The coefficient of viscocity is measured in S.I. units as ${Nm}^{- 2} \sec$

Dynes are the C.G.S. unit for viscosity. ${cm}^{- 2} \sec$

It is the same as one poise.

$1 P oise = 0.1 {Nm}^{- 2} \sec$

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