A thin uniform rod of length L and mass M is free to rotate in vertical plane as shown in figure below. The time period of its oscillation in vertical plane is
1
\(T = 2\;\pi \sqrt {\frac{l}{g}} \)
2
\(T = 2\;\pi \sqrt {\frac{3l}{4g}} \)
3
\(T = 2\;\pi \sqrt {\frac{2l}{3g}} \)
4
\(T = 2\;\pi \sqrt {\frac{l}{2g}} \)