The length of a metal wire is l1 when th...

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

`(l_1+l_2)/2`

B

`sqrt(l_1l_2)`

C

`(l_1T_2-l_2T_1)/(T_2-T_1)`

D

`(l_1T_2+l_2T_1)/(T_2+T_1)`

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