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+1 vote
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in Current Electricity by (26.1k points)
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The number density of free electrons in a copper conductor estimated is 8.5 × 1028 m-3 . How long does an electron take in drifting from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 × 10-6 m2 and it is carrying a current of 3.0 A.

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Best answer

n = 8.5 × 1028m-3; A = 2 × 10-6m2

I – 3.0A; I = 3m

I = vdneA

\(\frac{3}{t}=\frac{3}{8.5\times10\times1.6\times10\times2\times10}\)

t = 8.5 × 1128 × 1 .6 × 10-19 × 2 × 10-6

= 27.2 × 10-3sec.

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