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When a tension 'F' is applied, the elong...

When a tension 'F' is applied, the elongation produced in uniform wire of length l, radius r is e, when tension 2F is applied, the elongation produced in another uniform wire of length 2l and radius 2r made of same material is

A

`l`

B

`2l`

C

`l//2`

D

`4l`

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