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Q.

An elastic wire of length ℓ, area of cross-section A and Young's modulus Y having left end fixed and the other end is pulled by a constant force F, and the point of application of force is displaced by Δℓ.  Then:

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a

Work done by force is FΔℓ2

b

Elastic potential energy stored in the wire FΔℓ

c

Elastic potential energy stored in the wire 13FΔℓ

d

Work done by force is FΔℓ

answer is D.

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Detailed Solution

We know the force= FThe displacement due to this force= ΔlThus, work done= FΔl
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