Coefficient of linear expansion of b...

Coefficient of linear expansion of brass and steel rods are `sigma_(1)` and `sigma_(2)` length of brass and steel rods are `l_(1) ` & `l_(2)` if `(l_(2) - l_(1))` is maintained same at all temperature which one of the following relation hold good ?

`alpha_1l_1=alpha_2l_2`

`alpha_1l_2=alpha_2l_1`

`alpha_1l_2^2=alpha_2l_1^2`

`alpha_1^2l_2=alpha_2^2l_1`

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