Question

$SI$ unit of coefficient of viscosity is

• A. $N s m^{- 2}$
• B. $N \, s^{- 1 \, }m^{2}$
• C. $N \, s \, m^{- 3}$
• D. $N \, s^{- 2 \, }m$

Answer 1

Answer: (A)

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