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Coefficent of liner espansion of bress a...

Coefficent of liner espansion of bress and steel rods and `alpha_(1)` and `alpha_(2)` Lengths of brass and steel roda are `l_(1)` and `l_(2)` respectively, If `(l_(2)-l_(1))` is maintained same at all temperatures, which one of the following relations holds good ?

A

`alpha_(1)l_(1)=alpha_(2)l_(2)`

B

`alpha_(1)l_(2)=alpha_(2)l_(1)`

C

`alpha_(1)l_(2)^(2)=alpha_(2)l_(1)^(2)`

D

`alpha_(1)^(2)l_(2)=alpha_(2)^(2)l_(1)`

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