Practice portal › Current Electricity › Electric Current and Drift Velocity

Column-I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match Column-I and Column-II with appropriate relations.

Column-I	Column-II
(A) Drift velocity	(P) m/(ne²ρ)
(B) Electrical resistivity	(Q) nev_d
(C) Relaxation period	(R) (eE)/mτ
(D) Current density	(S) E/J

Asked in NEET 2021 · Drift velocity, mobility and current density

• (1) (A)-(R), (B)-(S), (C)-(P), (D)-(Q)
• (2) (A)-(R), (B)-(S), (C)-(Q), (D)-(P)
• (3) (A)-(R), (B)-(P), (C)-(S), (D)-(Q)
• (4) (A)-(R), (B)-(Q), (C)-(S), (D)-(P)

Step-by-step solution

Why the other options are wrong

• (2) Swaps (C) and (D): nev_d is the current density, and m/(ne²ρ) is the relaxation time.
• (3) Swaps (B) and (C): the resistivity is E/J, while m/(ne²ρ) is the relaxation time.
• (4) Gives the resistivity nev_d and the relaxation time E/J; those are the current density and the resistivity.

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