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

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$dyne {cm}^{- 2} \sec$

$dyne {cm}^{- 2} \sec^{- 1}$

${Nm}^{- 2} \sec$

$1 poise = 10^{- 1} {Nm}^{- 2} \sec$

answer is C.

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Detailed Solution

$F = ηA \frac{du}{dz}$

Where , $η$ = coefficient of viscosity , which is the measure of viscosity.

Its SI unit is ${Nm}^{- 2} \sec .$

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