Question a tungsten wire has a radius of 0070 mm and is, Ask an Expert

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Question: A tungsten wire has a radius of 0.070 mm and is heated from 20.0 to 1405 ^oC. The temperature coefficient of resistivity is Î± = 4.5 x 10^-3 (C^o)-1. When 150 V is applied across the ends of the hot wire, a current of 1.8 A is produced.

Question 1: How long is the wire?

I need help to find how long is the wire and neglect any effects due to thermal expansion of the wire.

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