Figure shows an elemental rectangular block ABCD , whose thickness normal to the plane of the figure is unity. The four faces are acted upon by pure shear stress of intensity σ . The maximum normal stress carried by any plane is

Q: Figure shows an elemental rectangular block ABCD , whose thickness normal to the plane of the figure is unity. The four faces are acted upon by pure shear stress of intensity σ . The maximum normal stress carried by any plane is

(a) σ

(b) √2 σ

(c) 2σ

(d) σ/√2