From the Hagen-Poiseuille equation, velocity is given by:

$\overline{){\mathbf{v}}{\mathbf{=}}{\mathbf{\left(}}\frac{\mathbf{1}}{\mathbf{4}\mathbf{\eta}}{\mathbf{\right)}}{\mathbf{\left(}}\frac{\mathbf{\u2206}\mathbf{P}}{\mathbf{\u2206}\mathbf{x}}{\mathbf{\right)}}{\mathbf{(}}{{\mathbf{R}}}^{{\mathbf{2}}}{\mathbf{-}}{{\mathbf{r}}}^{{\mathbf{2}}}{\mathbf{)}}}$

From the equation, r is the distance from the center of the tube.

When a viscous fluid flows in a tube, its velocity is __________.

A. The same everywhere

B. Greatest at the center of the tube

C. Greatest at the wall of the tube

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