A bar is subjected to equal and opposite forces as shown in the figure. PQRS is a plane making angle θ with the cross-section of the bar. If the area of cross-section be ‘A’, then what is the tensile stress on PQRS
(a) F/A
(b) Fcosθ/A
(c) Fcos2θ/ A
(d) F/A cosθ
