$ \Rightarrow \frac{{ - 12a}}{{{x^{11}}}} = \frac{{ - 6a}}{{{x^5}}} \Rightarrow x = {\left( {\frac{{2a}}{b}} \right)^{\frac{1}{6}}}$
$\begin{gathered}
{U_{at}}\,equilibrium = \frac{a}{{{{\left( {\frac{{2a}}{b}} \right)}^2}}} - \frac{b}{{\left( {\frac{{2a}}{b}} \right)}} \hfill \\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{{b^2}}}{{a4}}\,and\,{U_{\left( {x = \infty } \right)}} = 0 \hfill \\
\end{gathered} $
$\therefore $ $D = 0$$ - \left( { - \frac{{{b^2}}}{{4a}}} \right) = \frac{{{b^2}}}{{4a}}$
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| Column - $\mathrm{I}$ | Column - $\mathrm{II}$ |
| $(a)$ Velocity head | $(i)$ $\frac{P}{{\rho g}}$ |
| $(b)$ Pressure head | $(ii)$ $h$ |
| $(iii)$ $\frac{{{v^2}}}{{2g}}$ |
