• # question_answer A rectangular section beam subjected to a bending moment M varying along its length is required to develop same maximum bending stress at any cross- section. If the depth of the section is constant, then its width will vary as: A) $M$                            B) $\sqrt{M}$C) ${{M}_{2}}$                          D) $\text{1/M}$

Bending stress, $\sigma =\frac{M}{z}$ For $\sigma$ to remain constant,             $z\propto M$ For a rectangular beam of width b and depth h.             $z=\frac{b{{h}^{2}}}{6}$ $\therefore$         $b{{h}^{2}}\propto M$ For h=constant, $b\alpha \,M$