The Electron Density in Copper Is 8

question 18

Multiple Choice

The electron density in copper is 8.49 × 1028 electrons/m³. The electron charge is e = −1.60 × 10⁻¹⁹ C. When a 1.00-A current is present in a copper wire with a 0.40 cm² cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is

• A)−1.84 × 10⁻⁶.
• B)+1.84 × 10⁻⁶.
• C)−1.84.
• D)−5.43 × 10⁵.
• E)+5.43 × 10⁵.

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