The length of a metal wire is l(1) when ...

The length of a metal wire is `l_(1)` when the tension in it is `T_(1)` and is `l_(2)` when the tension is `T_(2)`. Then natural length of the wire is

A

`(I_(1)+I_(2))/(2)`

B

`(I_(1)T_(2)-I_(2)T)/(T_(2)-T_(1))`

C

`(I_(1)T_(2)+I_(2)T_(1))/(T_(2)+T_(1))`

D

`sqrt(I_(1)I_(2))`

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