The depth of neutral axis of a singly reinforced beam from the extreme compression fibre is:

where $α_{y}$ and $σ_{c k}$ are the characteristic strength of steel and concrete respectively and $A_{t}$ is the area of tension steel

- 1
  
  $2.417 \frac{σ_{y} A_{t}}{σ_{c k} b}$
- 2
  
  $2.417 \frac{σ_{c k} A_{t}}{σ_{b} b}$
- 3
  
  $2.417 \frac{σ_{y} b}{σ_{c k} A_{t}}$
- 4
  
  $2.417 \frac{σ_{c k} b}{σ_{y} A_{t}}$

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