Two different wires having lengths L1 and L2, and respective temperature coefficient of linear expansion α1 and α2,

Two different wires having lengths L₁ and L₂, and respective temperature coefficient of linear expansion α₁ and α₂, are joined end-to-end. Then the effective temperature coefficient of linear expansion is

Two different wires having lengths L1 and L2, and respective temperature coefficient of linear expansion α1 and α2,

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