A tape of length l and weight w kg/m is suspended at its ends with a pull of p kg. the sag correction is:
1
\(\frac{{{l^2}{w^2}}}{{24{p^2}}}\)
2
\(\frac{{{l^2}{w^3}}}{{24{p^2}}}\)
3
\(\frac{{{l^3}{w^2}}}{{24{p^2}}}\)
4
\(\frac{{{l^2}{w^2}}}{{24{p^3}}}\)