The bending moment of a cantilever beam of length $$l$$ and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is ________ at the fixed end.
A
$$\frac{{{\text{w}}l}}{2}$$
B
$${\text{w}}l$$
C
$$\frac{{{\text{w}}{l^2}}}{2}$$
D
$$\frac{{{\text{w}}{l^2}}}{6}$$
Correct Answer: $$\frac{{{\text{w}}{l^2}}}{6}$$