The amount of charge, ΔQ, contained in a section of the conductor with length, l, is given by: ΔQ=−enAl where Al is the volume of that secti...The amount of charge, ΔQ, contained in a section of the conductor with length, l, is given by: ΔQ=−enAl where Al is the volume of that section of the conductor, and, e, is the magnitude of the charge of the electron.