The ratio of the limiting value of the depth of neutral axis and the depth of the section of a singly reinforced beam is equal to

where $σ_{y}$ is the characteristic strength and $E_{s}$ is the modulus of elasticity of steel

- 1
  
  $\frac{0.0035}{0.0055 + 0.87 \frac{σ_{y}}{E_{s}}}$
- 2
  
  $\frac{0.0055}{0.0035 + 0.87 \frac{σ_{y}}{E_{s}}}$
- 3
  
  $\frac{0.0035}{0.0035 + 0.87 \frac{σ_{y}}{E_{s}}}$
- 4
  
  None of these

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