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(C) The drift velocity $v_d$ is given by the formula $v_d = \frac{eE	au}{m}$,where $E$ is the electric field.Since $E = \frac{V}{L}$,we have $v_d = \

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Remains unchanged

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(C) The drift velocity $v_d$ is given by the formula $v_d = \frac{eE	au}{m}$,where $E$ is the electric field.Since $E = \frac{V}{L}$,we have $v_d = \frac{eV	au}{mL}$.Here,$e$ is the charge of an electron,$V$ is the potential difference,$	au$ is the relaxation time,$m$ is the mass of the electron,and $L$ is the length of the wire.Note that the drift velocity $v_d$ depends only on the potential difference $V$,the length $L$,and the material properties (relaxation time $	au$).It does not depend on the diameter $d$ or the cross-sectional area $A$ of the wire.Therefore,if the diameter $d$ is doubled,the drift velocity $v_d$ remains unchanged.

$A$ potential difference $V$ is applied across the ends of a copper wire of diameter $d$ and length $L$. If only the diameter $d$ is doubled,the drift velocity becomes:

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