A cantilever beam of span I and flexural rigidity EI is subjected to a concentrated load W at mid-span. The slope at the free end is
1
\(\frac{{{\rm{W}}{{\rm{l}}^2}}}{{2{\rm{EI}}}}\)
2
\(\frac{{{\rm{W}}{{\rm{l}}^2}}}{{4{\rm{EI}}}}\)
3
\(\frac{{{\rm{W}}{{\rm{l}}^2}}}{{8{\rm{EI}}}}\)
4
\(\frac{{{\rm{W}}{{\rm{l}}^2}}}{{3{\rm{EI}}}}\)