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*Question:* What is the resistance at C of a m
long piece of no. 5 gauge copper wire (cross-sectional area
)?
What voltage must be applied across the two ends of the wire to produce a
current of 10A through it?

*Answer:* Using the basic equation , and the
value of for copper given in Tab. 2, we have

Using Ohm's law , we obtain

Richard Fitzpatrick
2007-07-14