Question

A uniform steel bar of cross-sectional area A and length L is suspended, so that it hangs vertically. The stress at the middle point of the bar is (`rho` is the density of stell)
A. `(L)/(2A) rho g`
B. `(L rho g)/(2)`
C. `(LA)/(rho g)`
D. `L rho g`

Answer 1

Correct Answer - b
At middle, T = weigth of half the length of steel bar
`= ((L)/(2)) A rho g`
`:.` Stress `= (T)/(A) = (L rho g)/(2)`