11. If one end of a wire is fixed with a rigid support and the other end is stretched by a force of 10 N, then the increase in length is 0.5 mm. The ratio of the energy of the wire and the work done in displacing it through 1.5 mm by the weight is
(a) 1/3 (b) 1/4
(c) 1/2 (d) 1
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a