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)`. The natural length of the wire is:

A

`frac(l_1+l_2)(2)`

B

`sqrtl_1l_2`

C

`frac(l_1T_2-l_2T_2)(T_2-T_1)`

D

`frac(l_1T_2+l_2T_2)(T_2+T_1)`

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