\begin{tabular}{|l|l}
Q.79 & Consider an electric pole with dimensions as shown in the figure. Let the end $R$ be \\
subjected to a vertical force $F$. The flexural rigidity of both vertical and horizontal \\
bars is $E I$. Neglect the axial deflection of the vertical bar, and all effects of \\
self-weight. The vertical deflection at end $R$ is \\
(A) & $\frac{7 F L^{3}}{3 E I}$ \\
(B) & $\frac{10 F L^{3}}{3 E I}$ \\
(C) & $\frac{5 F L^{3}}{3 E I}$ \\
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\end{tabular}
