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  3. 9 it is desired to make a 20 2 coil of wire which

9 It is desired to make a 20 2 coil of wire which has a...

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9 It is desired to make a 20 2 coil of wire which has a zero thermal coefficient of resistance To do this a carbon resistor of resistance R is placed in series with an iron resistor of resistance R The proportions of iron and carbon are so chosen that R R 20 92 for all temperatures near 20 C Find the values of R and R 0 5 10 3 C airon 5 x 10 3 C 1 a carbon comperature with

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