An iron rod of length 50 cm is joined at an end to an aluminium rod of equal length to form a system. All measurements refer to 20∘C. If coefficient of linear expension of iron and aluminium are 12×10−6∘C and 24×10−6∘C respectively, find average coefficient of linear expension of composite system?

An iron rod of length 50 cm is joined at an end to an aluminium rod of

1.	An iron rod of length 50 cm is joined at an end to an aluminium rod of equal length to form a system. All measurements refer to 20∘C. If coefficient of linear expension of iron and aluminium are 12×10−6∘C and 24×10−6∘C respectively, find average coefficient of linear expension of composite system?
Answer» An iron rod of length $50 cm$ is joined at an end to an aluminium rod of equal length to form a system. All measurements refer to $20^{\circ} C$ . If coefficient of linear expension of iron and aluminium are $12 \times {10^{- 6}}^{\circ} C$ and $24 \times {10^{- 6}}^{\circ} C$ respectively, find average coefficient of linear expension of composite system?

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