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An iron of length 50cm is joined at an e...

An iron of length `50cm` is joined at an end to copper rod to length `100cm` at `20^(0)C.` Find the length of the system at `100^(0)C` and average coefficient of linear expansion of the systeam.
`(*_(iron) = 12 xx 10^(-6 //0)C and*_(copper) = 17 xx 10^(-6 //0)C.)`

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