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Relation between electric current and drift velocity, , Consider a conductor of length / and uniform 2, Va m— /I, , area of cross-section A carrying current /., . Volume of the conductor = Al, , If n be the electron density i.e. no. of electrons per +=, , unit volume, then the total no. of electrons in the conductor = nAl, , If e is the charge on the electron, then total charge flowing inside the, conductor, q = neAl, , , , . l, Time taken by the electron to cross the conductor, t = a, d, , , , neAl, ad == 7- = neAvg, Ya, I neAv, Now, J =—-=——= nevy, , A A