One end of a uniform wire of length .L. and mass .M. is attached rigidly to a point in the roof and a load of mass .m. is suspended from its lower end. If A is the area of corss - section of the wire then find the stress in the wire at height .x. from its lower end `(x lt L)`

Explanation

Tension in the string at point .P. is T=wt of load + wt of wire of length .x.
`T = mg + M/L xg`
stress at `P = T//A = (mg)/(A) + (Mxg)/(AL)`