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Q.

If a wire is stretched by hanging a weight from its end, the elastic potential energy per unit volume in terms of the longitudinal strain σ and modulus of elasticity Y is :

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a

Yσ2/2

b

Yσ/2

c

2Yσ2/2

d

Y2σ/2

answer is A.

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Detailed Solution

U=12stream×strain =12 Y.(strain)2 =σ22Y
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