1.

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

Answer»

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

ANSWER :2


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