Two rods whose length difference stays constant or which expand equally (L1 alpha1 = L2 alpha2)

1. A.
   $\frac{\alpha_2}{\alpha_1}$
2. B.
   $\frac{\alpha_1}{\alpha_2}$
3. C.
   $\frac{\alpha_2}{\alpha_1+\alpha_2}$
4. D.
   $\frac{\alpha_1}{\alpha_1-\alpha_2}$

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1. A.
   $\frac{\alpha_i}{\alpha_c+\alpha_i}$
2. B.
   $\frac{\alpha_c}{\alpha_c+\alpha_i}$
3. C.
   $\frac{\alpha_i-\alpha_c}{\alpha_c+\alpha_i}$
4. D.
   $\frac{\alpha_c-\alpha_i}{\alpha_c+\alpha_i}$

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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.
   $\frac{\alpha_A}{\alpha_B}$
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.
   $l_A = 200\text{ cm}, l_B = 140\text{ cm}$
2. B.
   $l_A = 180\text{ cm}, l_B = 120\text{ cm}$
3. C.
   $l_A = 160\text{ cm}, l_B = 100\text{ cm}$
4. D.
   $l_A = 120\text{ cm}, l_B = 60\text{ cm}$

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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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1. A.
   $l_{A} = 120\text{ }cm,l_{B} = 60\text{ }cm$.
2. B.
   $l_{A} = 180\text{ }cm,l_{B} = 120\text{ }cm$.
3. C.
   $l_{A} = 240\text{ }cm,l_{B} = 180\text{ }cm$.
4. D.
   $l_{A} = 270\text{ }cm,l_{B} = 210\text{ }cm$.

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