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7. The resistivity of seawater is p= 25 2.cm and the number of charges per volume is 6 ×
1020 ions/
cm3
each with charge q
1.6 x 10-19 C. If we fill a tube 2 m long with
seawater and connect a 12-volt battery, what is the resulting average drift velocity of the
ions (Answer in cm/s)?

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