The resistivity of seawater is about [tex]0.25[/tex] ohm-meter. The charge carriers are chiefly [tex]\mathrm{Na}^{+}[/tex]and [tex]\mathrm{Cl}^{-}[/tex]ions, and of each there are about [tex]3 \cdot 10^{26}[/tex] per [tex]\mathrm{m}^3[/tex]. If we fill a plastic tube 2 meters long with seawater and connect a 12 volt battery to the electrodes at each end, what is the resulting average drift velocity of the ions?
