Two rods of equal length between the same temperatures conduct heat at equal rates: condition on K and A

1. A.
   $A_1K_2 = A_2K_1$
2. B.
   $A_1K_1 = A_2K_2$
3. C.
   $\dfrac{A_1K_1}{C_1} = \dfrac{A_2K_2}{C_2}$
4. D.
   $\dfrac{A_1K_2}{C_1} = \dfrac{A_2K_1}{C_2}$

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1. A.
   $K_1A_2 = K_2A_1$
2. B.
   $K_1A_1 = K_2A_2$
3. C.
   $K_1A_1^2 = K_2A_2^2$
4. D.
   $K_1 = K_2$

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