The equivalent length of a column of length L, having both the ends hinged, is

Answer: Option B

Both ends hinged $$l=\text{L}$$
Both ends fixed $$l=\frac{\text{L}}{2}$$
One end hinged and other end fixed $$l=\frac{\text{L}}{\sqrt{2}}$$
One end hinged another end free $$l=2\text{L}$$