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(A) The drift velocity $v_d$ of electrons in a conductor is given by the formula: $v_d = \frac{eE	au}{m}$,where $e$ is the charge of an electron,$E$

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(A) The drift velocity $v_d$ of electrons in a conductor is given by the formula: $v_d = \frac{eE	au}{m}$,where $e$ is the charge of an electron,$E$ is the electric field,$	au$ is the relaxation time,and $m$ is the mass of the electron.Since the electric field $E = \frac{V}{L}$,where $V$ is the potential difference and $L$ is the length of the wire,we can substitute this into the drift velocity equation:$v_d = \frac{eV	au}{mL}$.From this expression,it is clear that the drift velocity $v_d$ is directly proportional to the potential difference $V$ $(v_d \propto V)$.Therefore,if the potential difference $V$ is doubled,the drift velocity $v_d$ will also be doubled.

$A$ potential difference is applied across the ends of a metallic wire. If the potential difference is doubled,then the drift velocity

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