[" One end of uniform wire of length L and "],[" of weight W is attached rigidly to a point "],[" in the roof and a weight W_1 ~ i s ~ s u s p e n d e d ~ "],[" from its lower end.If s is the area of "],[" cross section of the wire,the stress in the "],[" wire at a height ( 3L/4) from its lower end "],[" is "]