Coefficient of linear expansion of brass...

Coefficient of linear 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 temperature, which one of the following relations holds good?

`alpha_1l_1 = alpha_2l_2`

`alpha_1l_2 = alpha_2l_1`

`alpha_1^2l_2=alpha_2^2l_1`

`alpha_1l_2^2 = alpha_2l_1^2`

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