A copper wire has 8.5x10 28 free electrons
per cubic meter. A 71cm length of 12
gauge copper wire that is 2.05 mm in
diameter carries 4.85A current. How
much time does it take for an electron
to travel the length of wire ans: 110 min
Answers
Answer:
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Answer:
To determine:(a) Time taken to cover a distance of 0.71 m.(b) Time taken to cover a distance for 6 gauge copper wire.(c) How does changing the diameter of the wire that carries a given amount of current affect the drift velocity of the electrons in the wire?Answer: (a) Time taken to cover a distance of 0.71 m is .(b) Time taken to cover a distance for 6 gauge copper wire is (c) Drift velocity and radius are inversely proportional to each other. Hence, increase in diameter causes decreases in drift velocity.Explanation:(a)The expression for drift velocity in terms of current is,The area of wire is, Substitute for in equation 1.Substitute for , for n , for and for.Time taken to cover a distance of 0.71 m is,Substitute for and for.Therefore, Time taken to cover a distance of 0.71 m is .(b)Time taken to cover a distance is,Substitute for .Time is proportional to .(c)The expression for drift velocity in terms of current is,Drift velocity and radius are inversely proportional to each other. Hence, increase in diameter causes decreases in drift velocity.
Explanation:
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