The diameters of copper wires A and B are equal. The current carried by wire A is twice the current carried by wire B. In which wire do the charge carriers have the higher drift speed?

Expert Answers
Charlie Hooper eNotes educator| Certified Educator

 I= qnAv relates the current I in a wire to the charge q of the charge carriers, the number density n of charge carriers, the cross-sectional area A of the wire, and the drift velocity v of the charge carriers.

Since wire A carries the larger current, then its drift speed must be larger since the quantities are directly proportional.

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