For beams breadth is constant,
A
Depth $${\text{d}} \propto {\text{M}}$$
B
Depth $${\text{d}} \propto \sqrt {\text{M}} $$
C
Depth $${\text{d}} \propto 3\sqrt {\text{M}} $$
D
Depth $${\text{d}} \propto \frac{1}{{\text{M}}}$$
Correct Answer: Depth $${\text{d}} \propto \sqrt {\text{M}} $$
