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The length of a current-carrying cylindr...

The length of a current-carrying cylindrical conductor is l, its area of cross-section is A, the number density of free electrons in it is n, and the drift velocity of electrons in it is `v_d` . The number of electrons passing through a particular cross-section of the conductor per unit time is given by:

A

nA

B

`nAv_d`

C

`nv_d`

D

`Av_d`

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