In the figure shown above, if AOB is the conductor, A and B are points of supports. Then which of the following is expression to calculate sag? (assume all other quantities with usual notations)
1
\(\frac{{w{l^2}}}{{8T}}\)
2
\(\frac{{w{l^2}}}{{2T}}\)
3
\(\frac{{w{l^2}}}{{T}}\)
4
\(\frac{{w{l^2}}}{{4T}}\)