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}