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12. A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1.0 mm, the increase in energy of the wire will be

(a)   0.01 J                                               (b)   0.02 J

(c)   0.04 J                                              (d)   1.00 J

Answer-a

(37)

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