Difference between the lengths of two rods stays the same at all temperatures: ratio of their lengths

1. A.
   $\frac{\alpha_A}{\alpha_B}$
2. B.
   $\frac{\alpha_B}{\alpha_A}$
3. C.
   $\frac{\alpha_A + \alpha_B}{\alpha_A}$
4. D.
   $\frac{\alpha_A + \alpha_B}{\alpha_B}$

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1. A.
   $\frac{\alpha_A}{\alpha_B}$
2. B.
   $\frac{\alpha_B}{\alpha_A}$
3. C.
   $\frac{\alpha_A + \alpha_B}{\alpha_A}$
4. D.
   $\frac{\alpha_A + \alpha_B}{\alpha_B}$

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1. A.
   $\ \alpha_{1}^{2}l_{1} = \alpha_{2}^{2}l_{2}$
2. B.
   $\frac{l_{1}}{l_{2}} = \frac{\alpha_{2}}{\alpha_{1}}$
3. C.
   $\frac{l_{1}}{l_{2}} = \frac{\alpha_{1}}{\alpha_{2}}$
4. D.
   $\ l_{1}^{2}\alpha_{2} = l_{2}^{2}\alpha_{1}$

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