In a plane stress problem there are normal tensile stresses $σ_{x}$ and $σ_{y}$ accompanied by shear stress $τ_{x y}$ at a point

along orthogonal cartesian coordinates $x$ and $y$ respectively. If it is observed that the minimum principal stress on a

certa

- 1
  
  $τ_{x y} = \sqrt{σ_{x} + σ_{y}}$
- 2
  
  $τ_{x y} = \sqrt{σ_{x} - σ_{y}}$
- 3
  
  $τ_{x y} = \sqrt{σ_{x} . σ_{y}}$
- 4
  
  $τ_{x y} = \sqrt{σ_{x} / σ_{y}}$

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