If modular ratio is m, effective depth is d and stress ratio is $τ = σ_{s t} / σ_{c b}$ then the depth of neutral axis $(n_{c})$ of a balanced section is

- 1
  
  $\frac{m}{m - τ} x d$
- 2
  
  $\frac{m}{m + τ} x d$
- 3
  
  $\frac{m + τ}{m} x d$
- 4
  
  $\frac{m}{τ} x d$

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