For a balanced reinforced section, the depth of critical neutral axis from the top of the beam $(n_{c})$ is given by the relation

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

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