The electron density in copper is 8.49 × 10^28 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 × 10^5.
e. +5.43 × 10^5.
A
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