The linear expansion coefficients of brass and steel wires are $\alpha_1$ and $\alpha_2$ respectively,and their lengths at $0^\circ C$ are $L_1$ and $L_2$. If the difference $(L_2 - L_1)$ remains constant at any temperature,then:
- A$\alpha_1 L_2 = \alpha_2 L_1$
- B$\alpha_1 L_2^2 = \alpha_2 L_1^2$
- C$\alpha_1^2 L_1 = \alpha_2^2 L_2$
- D$\alpha_1 L_1 = \alpha_2 L_2$
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