Current Electricity PYQ — NEET 2021 · Q158 with Solution

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)	${m \over {n{e^2}p}}$
(B)	Electrical Resistivity	(Q)	$ne{\upsilon _d}$
(C)	Relaxation Period	(R)	${{eE} \over m}\tau$
(D)	Current Density	(S)	${E \over J}$

A
(A)-(R); (B)-(Q); (C)-(S); (D)-(P)
B
(A)-(R); (B)-(S); (C)-(P); (D)-(Q)
C
(A)-(R); (B)-(S); (C)-(Q); (D)-(P)
D
(A)-(R); (B)-(P); (C)-(S); (D)-(Q)

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Correct answer: B

Current density, J = ${I \over A}$ = nev_d

Drift velocity, V_d = ${{eE} \over m}$$\tau$ ;

Electrical resistivity, $\rho$ = ${m \over {n{e^2}\tau }}$ or $\rho$ = ${E \over J}$

Relaxation period, $\tau = {m \over {n{e^2}\rho }}$

A $\to$ R

B $\to$ S

D $\to$ Q

C $\to$ P

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