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

`(l1+l)/2`

B

`(l1T_(2)+l_(2)T_(1)`

C

`(l1T_(2)+l_(2)T_(1))/(T_(2)-T_(1)`

D

`sqrt(T_(1)T_(2)l_(1)l_(2)`

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