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(B) The current $I$ in a conductor is given by the formula $I = neAv_d$, where $n$ is the electron number density, $e$ is the charge of an electron, $

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electron number density is very large

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(B) The current $I$ in a conductor is given by the formula $I = neAv_d$, where $n$ is the electron number density, $e$ is the charge of an electron, $A$ is the cross-sectional area, and $v_d$ is the drift velocity.Even though the drift velocity $v_d$ is very small (typically $10^{-4} \, m/s$) and the charge $e$ is small $(1.6 	imes 10^{-19} \, C)$, the number density $n$ of free electrons in a conductor is extremely large, typically of the order of $10^{28} \, m^{-3}$.Therefore, the product $neAv_d$ results in an appreciably large current.

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because

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