Sets of principal stresses acting at any point in a stressed body are given below:

1. $\{σ, 0\}$

2. $\{σ, σ\}$

3. $\{σ, - σ\}$

4. $\{σ, \frac{σ}{2}\}$

- 1
  $1, 4, 3, 2$
- 2
  
  $2, 1, 4, 3$
- 3
  
  $1, 3, 4, 2$
- 4
  
  $2, 4, 1, 3$

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