The magnitude of the resultant stress on a plane in which the maximum shear stress occurs is

Question

A piece of material is subjected, to two perpendicular tensile stresses of 70 MPa and 10MPa. The magnitude of the resultant stress on a plane in which the maximum shear stress occurs is                      

         (a) 70 MPa                         (b) 60 MPa

         (c) 50 MPa                         (d) 10 MPa