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Coefficient of liner expansion of brass ...

Coefficient of liner expansion of brass and steel rods are `alpha_(1)` and `alpha_(2)`. Length of brass and steel rods are `l_(1)` and `l_(2)` respectively. If `(l_(2)-l_(1))` is maintained same at all temperatures, which one of the following relations hold good ?

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`(l_(2))/(l_(1))`
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