The rectangular block shown in Fig. 10.48 is subjected to pure shear of intensity $' q'$ .

If $B E$ represents the principal plane and the principal stresses are $σ_{1,} σ_{2};$ then the values of $\emptyset$

- 1
  $0 °, 90 °; + q$ and $- q$
- 2
  
  $30 °, 120 °; + q$ and $- q$
- 3
  
  $45 °, 135 °; + \frac{q}{2}$ and $- \frac{q}{2}$
- 4
  
  $45 °, 135 °; + q$ and $- q$

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