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18. The coefficient of linear expansion of an inhomogeneous rod changes linearly from α1 tofrom one end to the other end of the rod.The effective coefficient of linear expansionof rod is\alpha_{1}+\alpha_{2} \quad \text { 2) } \frac{\alpha_{1}+\alpha_{2}}{2} \quad 3 ) \sqrt{\alpha_{1} \alpha_{2}} \text { 4) } \alpha_{1}-\alpha_{2}2

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