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Q.

One end of uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight W1 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 

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a

W1+Ws

b

W1+3W4/s

c

W1s

d

W1+W4/s

answer is C.

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Detailed Solution

Force = weight suspended + weight of 3L/4 of wire

=W1+3W4 Stress = Force  Area =W1+3W4/s

 

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