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If the work done in stretching a wire by...

If the work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of same material but with double radius of cross-section and half the length by 1 mm (in joule) is

A

16 J

B

8 J

C

`frac{1}{16} J`

D

`frac{1}{8} J`

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