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Question

Two wires A and B of same dimensions are stretched by same amount of force. Young's modulus of A is twice that of B. Which wire will get more elongation? Enter 1 for A and 2 for B.

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Solution

Youmng's modulus =longitudinal stresslongitudinal strain
i.e, Y=F/AΔl/l
Δl=FlAY
Δl1Y
As YA=2YB so B has more elongation (Δl)

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