An aluminium measuring rod, which is cor...

An aluminium measuring rod, which is correct at `5^@C` measures the length of a line as 80 cm at `45^@C` If thermal coefficient of linear expansion of aluminium is `2.50xx10^(-4)//^@C`, the correct length of the line is:

`80.05cm`

`79.92cm`

`81.12cm`

`79.62cm`

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