Q. $SI$ unit of coefficient of viscosity is

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A

$N s m^{- 2}$

B

$N \, s^{- 1 \, }m^{2}$

C

$N \, s \, m^{- 3}$

D

$N \, s^{- 2 \, }m$

Solution:

We know that, Viscous force,
$F=-\etaA\frac{d v}{d x}$
or $\eta=-\frac{F}{A . \frac{d v}{d x}} \, $ Thus, unit is $\text{N s m}^{- 2}$

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