Coefficient of linear expansion of brass...

Coefficient of linear expansion of brass and steel rods are `a_1` and `a_2`. Lengths 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 holds good?

`a_1`^2 l_2 = a_2^2 l_1`

`a_1 l_1 = a_2^2 l_2`

`a_1 l_2 = a_2^2 l_1`

`a_1 l_2^2 = a_2 l_1^2`

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