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The length of a metal wire is l when the...

The length of a metal wire is `l` when the tension in it is .F. and .`xl`. when the tension is .yF.. Then the natural length of the wire is

A

`((x-y)l)/(x-1)`

B

`((y-x)l)/(y-1)`

C

`((x-y)l)/(x+1)`

D

`((y-x)l)/(y+1)`

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