The permissible direct shear stress of the weld is

Question

The thickness of the continuous weld used for connecting a horizontal square bar of 150mm size and of cantilevered length 500 mm to a vertical plate, with the bar carrying a 25 kN vertical load at its outer tip, given the permissible direct shear stress of the weld is 20 N/mm², is                                  

         (a) 3 mm               (b) 4 mm

         (c) 5 mm               (d) 6 mm