The rate of flow of liquid in a tube of radius $r,$ length $ l,$ whose ends are maintained at a pressure difference $P$ is $V = \frac{{\pi QP\,{r^4}}}{{\eta l}}$ where $\eta $ is coefficient of the viscosity and $Q$ is
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(b) $Q=V$
$V=\frac{\pi(\Delta P) r^{4}}{8 \eta e}$
$Q=\frac{1}{8}$
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