Vd=neAi Vd=1022×1.6×10−19×π(10−3)210Vd=1.6π×10−310=π6.25×103 m/s
NEET UG 2023 — Physics Electromagnetism
A copper wire of radius 1 mm contains 1022 free electrons per cubic metre. The drift velocity for free electrons when 10 A current flows through the wire will be (Given, charge on electron =1.6×10−19C )
Held on 30 Apr 2023 · Verified 9 Jul 2026.
π6.25ms−1
π6.25×105ms−1
π6.25×104ms−1
π6.25×103 m s−1
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