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The rectangular block shown in the given figure is subjected to pure shear to intensity 'q'. If BE represents the i principal plane and the principal stresses are σ1, σ2 ; then the values of θ, σ1 and σ2 will be respectively.

θ°, 90°; + q and - q
30°, 120°; + q and - q
45°, 135°; + and
45°, 135°; + q and - q

Correct Answer: 45°, 135°; + q and - q

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