One end of a uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight `W_(1)` is suspended 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

Options

A. `(W_(1))/s`
B. `[W_(1)+W/4]s`
C. `[W_(1)+(3W)/4]//s`
D. `(W_(1)+W)/s`

Answer

C

Explanation

Force`=`Weight suspended `+` weight of `3L//4` of wire
`=W_(1)+(3W)/4`
`"Stress"="Force"/"Area"`