The normal stress at that point on the maximum shear stress plane is

Question

A system under biaxial loading induces principal stresses of 100 N/cm2 tensile and 50 N/cm2 compressive at a point. The normal stress at that point on the maximum shear stress plane is                                              

(a) 75 N/ mm² tensile 

(b) 50 N/ mm² compressive

(c) 100 N/ mm² tensile

(d) 25 N/ mm² tensile