Assume that each atom of copper contributes one free electron. What is the average drift velocity of conduction electrons in a copper wire of cross-sectional area ${10^{ - 7}}\,\,{{\rm{m}}^2}$, carrying a current of ${\rm{1}}{\rm{.5}}\,{\rm{ A}}$ ? (Given density of copper $9\,\, \times \,\,{10^{ - 3}}\,\,{\rm{kg}}{{\rm{m}}^{ - 3}}$; atomic mass of copper ${\rm{ = }}\,{\rm{63}}{\rm{.5}}$; Avogadro’s number $ = 6.023\,\, \times \,\,{10^{23}}$ per gram atom)