For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is

- 1
  
  $\frac{w l^{2}}{4}$
- 2
  
  $\frac{w l^{2}}{8}$
- 3
  
  $\frac{w l^{2}}{12}$
- 4
  
  $\frac{w l^{2}}{16}$

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