The resistivity of sea water is about 25ohm cm.The charge carriers are chiefly Na+ and cl- ions,and of each there are about 3 x 10^20 cm^-3.If we fill a plastic tube 2m long with sea water and connect a 12 v battery to the electrodes at each end ,what is the resulting average drift velocity of the ions in cms^-1?

Dear Student,
                         we know that i=nqAvd=VRhere R=ρlAso nqAvd=VA/ρlor vd=Vnqlρnow put the valus of all the parameterswe will   getvd=122×3×1020×1.6×10-19×200×25=2.5×10-5cm/s

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