3. Calculate the work done, if a wire is loaded by ‘Mg’ weight and the increase in length is ‘l’
(a) Mgl (b) Zero
(c) Mgl/2 (d) 2Mgl
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a