When a steel wire fixed at one end is pulled by a constant force F at its other end, its length in equilibrium increases by l. Which of the following statements is not correct?
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Question

When a steel wire fixed at one end is pulled by a constant force F at its other end, its length in equilibrium increases by l. Which of the following statements is not correct?

G1 Physics · Accepted Answer

Use stress σ=F/A, strain ε=ΔL/L and Young's modulus Y=σ/ε. For a uniform segment, ΔL=FL/(AY); for thermal restraint, thermal strain αΔT produces stress YαΔT. Evaluating the given data/statements gives D: The heat produced is equal to half of the elastic potential energy of the wire.. Therefore the correct answer is D.