Discussion
An eccentric pole 6m high is fixed into the foundation. It carries a wire at the top and is free to move sideways. The effective length of the pole is :
Answer: C
The effective length is 12m.
The pole is fixed at its base in the foundation, and its top is free to move sideways, so it behaves as a column with one end fixed and the other free. For that case the effective length is twice the actual length.
\[ L_e = 2L = 2 \times 6 = 12\ \text{m} \]
6 m would apply with both ends hinged, 3 m with both ends fixed (0.5L), and 18 m matches no standard end condition.
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