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Drift velocity v_d is given by:

AeEτ/m
BeE/m
CmE/(eτ)
DeE × m × τ
Answer & Solution
Correct answer: A. eEτ/m
During relaxation time τ, electron accelerates with a = eE/m. We have So v_d = aτ. So So v_d = eEτ/m. Negative direction relative to E (because charge is negative).
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