The coefficients of linear expansion of brass and steel rods are $\alpha_1$ and $\alpha_2$ respectively. The lengths of the brass and steel rods are $l_1$ and $l_2$ respectively. If $(l_2 - l_1)$ is maintained the same at all temperatures,which one of the following relations is correct?
- A$\alpha_1 l_2 = \alpha_2 l_1$
- B$\alpha_1^2 l_2 = \alpha_2^2 l_1$
- C$\alpha_1 l_2^2 = \alpha_2 l_1^2$
- D$l_1 \alpha_1 = l_2 \alpha_2$
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