The principal stresses σ1 and σ2 are

Question

The State of stress at a point in a loaded member is $\sigma _{x} = 400Mpa$, $\sigma _{y} = -400Mpa$ and $\tau _{xy} = \pm300Mpa$. The principal stresses σ₁ and σ₂ are                                  

(a) 300 MPa and  - 700 MPa

(b) 400 MPa and  - 600 MPa

(c) 500 MPa and – 500 MPa

(d) 600 MPa and – 400 MPa