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A wire of initial length L and radius r ...

A wire of initial length L and radius r is stretched by a length l. Another wire of same material but with initial length 2L and radius 2r is stretched by a length 2l. The ratio of the stored elastic energy per unit volume in the first and second wire is,

A

`1: 4`

B

`1: 2`

C

`2: 1`

D

`1: 1`

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