The drift speed in a copper wire is 7.89 ✕ 10−5 m/s for a typical electron current. calculate the magnitude of the electric field e inside the copper wire. the mobility of mobile electrons in copper is 4.5 ✕ 10−3 (m/s)/(n/c). (note that though the electric field in the wire is very small, it is adequate to push a sizable electron current through the copper wire.)

 = 0.0175 N/C

Explanation:

= drift speed in a copper wire = 7.89 x 10⁻⁵ m/s

μ = mobility of mobile electrons in copper wire = 4.5 x 10⁻³ (m/s)/(N/C)

= magnitude of electric field in the wire

Drift speed is given as

= μ

Inserting the values

7.89 x 10⁻⁵ = (4.5 x 10⁻³)

 = 0.0175 N/C

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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