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A wire of length L and radius r is fixed...

A wire of length `L` and radius `r` is fixed at one end. When a stretching force `F` is applied at free end, the elongation in the wire is `l`. When another wire of same material but of length `2L` and radius `2r`, also fixed at one end is stretched by a force `2F` applied at free end, then elongation in the second wire will be

A

`frac{l}{2}`

B

l

C

2 l

D

`frac {l}{4}`

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