### Determine the leghth of wire

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A tungsten wire has a radius of 0.070 mm and is heated from 20.0 to 1416 oC. The temperature coefficient of resistivity is ? = 4.5 x 10-3 (Co)-1. When 180 V is applied across the ends of the hot wire, a current of 1.0 A is produced. How long is the wire? Neglect any effects due to thermal expansion of the wire.

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