6. If the force constant of a wire is K, the work done in increasing the length of the wire by l is
(a) Kl/2 (b) Kl
(c) Kl2 /2 (d) Kl2
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a