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electric field in a current carrying wire

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A cylindrical tungsten filament 15 cm long with a diameter of 1.0 mm is carrying a current of 12.5A an it is to be used in an environment with changing ambient temperature (from 20 to 120C).
What is the maximal electric field in the wire.
What is the resistance?
What will be the maximal potential drop?

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Solution Summary

The solution shows how to obtain the resistance and electric field in a current carrying wire and how it depends on the temperature.
3 pages include full derivations.

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