One end of a unifrom wire of length L and weigth 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 then the stress in the wire at a height `(3L)/(4)` from its lower end isA. `((W_(1) + W))/(S)`B. `(W_(1))/(S)`C. `((W_(1) + (3W)/(4)))/(S)`D. `((W_(1) + (W)/(4)))/(S)`

One end of a unifrom wire of length L and weigth W is attached rigidly

1.	One end of a unifrom wire of length L and weigth 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 then the stress in the wire at a height `(3L)/(4)` from its lower end isA. `((W_(1) + W))/(S)`B. `(W_(1))/(S)`C. `((W_(1) + (3W)/(4)))/(S)`D. `((W_(1) + (W)/(4)))/(S)`
Answer» Correct Answer - c Downward force acting at A = weight of `(3)/(4)` length of the wire + weight attached `W_(1)` `= (3)/(4) W + W_(1)` `:.` Stress `= (F)/(A) = (W_(1) + (3)/(4) W)/(S)`

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