27. A vertical hanging bar of length l & mass m per unit lenght carries a load of Mass M at lower end, its upper end is clamped to a rigit support. The tensile stress a distance x from support is ( A= area of cross section of bar) 1) Mg + mg (1-x)/A 2) Mg/A 3) Mg + mgl/A 4) (M+m)gx/Al

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