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A wire of length 'L' and radius 'r' is c...

A wire of length 'L' and radius 'r' is clamped rigidly at one end. When the other end of the wire is pulled by a force f, its length increases by 'l'. Another wire of same material of length '2L', and radius '2r' is pulled by a force '2f'.Then the increase in its length will be:

A

2l

B

l

C

l/2

D

4l

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