When a beam is subjected to co-existent bending stress $(σ_{b})$ and shear stress $(τ)$ , then the equivalent stress is equal to

- 1
  
  $\sqrt{{σ^{2}}_{b} + τ^{2}}$
- 2
  
  $\sqrt{{σ^{2}}_{b} + 2 τ^{2}}$
- 3
  
  $\sqrt{{σ^{2}}_{b} + 3 τ^{2}}$
- 4
  
  $\sqrt{{σ^{2}}_{b} + 4 τ^{2}}$

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