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Q.

When a wire is stretched to double its length 

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a

Its radius is halved 

b

Its strain is unity

c

Young’s modulus is equal to twice the elastic energy per unit volume

d

Its stress becomes equal to its Young’s modulus 

answer is B, C, D.

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Detailed Solution

Strain   =1

Y = stress

U=12stress×strain×v

Uv=12×stress×strain=Y2

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