Drift velocity ${v_d}$ varies with the intensity of electric field as per the relation
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(a) ${v_d} = \frac{e}{m} \times \frac{V}{l}\tau $ or ${v_d} = \frac{e}{m}.\frac{{El}}{l}\tau $ (Since $V = El)$
$\therefore {v_d} \propto E$
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