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A metal wire of diameter 2 mm and length...

A metal wire of diameter 2 mm and length 100 m has a resistance of `0.5475 Omega " at " 20^(@)C` and `0.805 Omega " at " 150^(@)C`. Find (i) the temperature of coefficient of resistance (ii) resistance at `0^(@)C` (iii) resistivities at `0^(@)` and `20^(@)C`.

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