Hi all,
I was wondering whether anyone could explain why the answer to this question is that the drift velocity stays the same?:
"A copper wire of length l and diameter d has potential difference V applied across its two ends. The drift velocity is v. if the diameter of the wire is made 0.5d, then the drift velocity becomes what?"
I used the appropriate equation (Current = (Drift velocity)(cross sectional area)(number density)(charge on each charge carrier)) and I came to the answer that the drift velocity should be four times larger, assuming all other values in the equation remain the same.
Please explain.
Thank you!