In a Singly reinforced beam, the depth of neutral axis below the top of the beam ( $n_{c}$ ) is given by

- 1
  
  $n_{c} = \frac{m x σ_{c b}}{m x σ_{c b} + σ_{s t}} x d$
- 2
  
  $n_{c} = \frac{m x σ_{c b}}{m x σ_{c b} - σ_{s t}} x d$
- 3
  
  $n_{c} = \frac{m x σ_{c b} + σ_{s t}}{m x σ_{c b}} x d$
- 4
  
  $n_{c} = \frac{m x σ_{c b} - σ_{s t}}{m x σ_{c b}} x d$

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