Q.

A wire of cross-section A is stretched horizontally between two clamps located 2 l metre apart. A weight W kg is suspended from the mid point of the wire. If the mid point sags vertically through a distance x < l the value of stress is:

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a

WI2xA

b

WI4xA

c

2WIlA

d

4xWlA

answer is .

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Detailed Solution

From the figure it is clear that 2Tcosθ = W

  T  = W2 cosθ

Now cos θ = xl2+x2 = xl [1+x22l2]

If x22l2 is neglected being small, then cosθ = x1

T = W2x

Stress = TA = (Wl2x)AWl2xA = Wl2Ax 

Correct choice is (a).

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