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Q.

When a wire is stretched to double its length

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a

strain is unity

b

stress is equal to Young’s modulus of elasticity

c

its radius is halved

d

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

answer is A, B, D.

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Detailed Solution

 

Strain,       e = ll =ll = 1

Stress, f = eY=1× Y= Y

Potential energy, U = e2Y2=12Y2Y = 2U

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