The shear force of a cantilever beam of length $$l$$ and carrying a gradually varying load from zero at the free end and w per unit length at the fixed end is _________ at the fixed end.
A
Zero
B
$$\frac{{{\text{w}}l}}{4}$$
C
$$\frac{{{\text{w}}l}}{2}$$
D
$${\text{w}}l$$
Correct Answer: $$\frac{{{\text{w}}l}}{2}$$