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A wire fixed at the upper end stretches by length l by applying a force F. What is the work done in stretching?

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A wire fixed at the upper end stretches by length l by applying a force F. What is the work done in stretching?

(a) F/2l

(b) Fl

(c) 2Fl

(d) Fl/2

I had been asked this question during an internship interview.

The question is from Stress and Strain topic in chapter Thermal Properties of Matter of Engineering Physics I

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Correct answer is (d) Fl/2

For explanation: W = 1/2 Stretching force×increase in length

W = 1/2 Fl.

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