If the principal stresses at a point in a strained body are $p_{1}$ and $p_{2}$ ( $p_{1 >}$ $p_{2}$ ), then the resultant stress on a plane carrying the maximum shear stress is equal to

- 1
  
  $\sqrt[]{{P_{1}}^{2} + {P_{2}}^{2}}$
- 2
  
  $\sqrt{\frac{{P_{1}}^{2} + {P_{2}}^{2}}{2}}$
- 3
  
  $\sqrt{\frac{{P_{1}}^{2} - {P_{2}}^{2}}{2}}$
- 4
  
  $\frac{\sqrt{{P_{1}}^{2} + {P_{2}}^{2}}}{2}$

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