The Electron Density in Copper Is 8

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.