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When the tenstion on a wire is 4N its le...

When the tenstion on a wire is 4N its length is `l_(1)`. When the tension on the wire is 5N its length is `l_(2)`. Find its natural length.

A

`5l_(1)-4l_(2)`

B

`4l_(1)-5l_(2)`

C

`10l_(1)-8l_(2)`

D

`8l_(1)-10l_(2)`

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