The equation $τ = - \frac{d p}{d l} \frac{r}{2}$ for flow through circular tubes, where $τ$ is shear stress at distance r from centre, is applicable for

- 1
  
  laminar flow only
- 2
  
  turbulent flow only
- 3
  
  critical flow
- 4
  
  both laminar and turbulent flows

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