Drift Velocity: a Wire Has a Cross-Sectional Area of 0

question 48

Multiple Choice

Drift velocity: A wire has a cross-sectional area of 0.10 mm². If there are 4.0 × 10²⁸ atoms per cubic meter in this wire, and if each atom contributes 2 free electrons, what is the drift velocity of the electrons when the current in the wire is 6.0 A? (e = 1.60 × 10^-19C)

• A) 0.0047 m/s
• B) 0.0092 m/s
• C) 0.94 m/s
• D) 0.019 m/s

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