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A uniform conductor has cross-section A, electron density n and drift velocity vd. What is the current?
AI = n e A / vd
BI = e vd A / n
CI = n e vd A
DI = n vd / (e A)
Answer & Solution
Correct answer: C. I = n e vd A
Charge crossing area A each second is the carrier density times charge times drift velocity times A, so I = n e vd A.
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