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