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 | $(P)$ $\frac{m}{n e^{2} \rho}$ |
| $(B)$ Electrical Resistivity | $(Q)$ $\mathrm{ne} v_{\mathrm{d}}$ |
| $(C)$ Relaxation Period | $(R)$ $\frac{\mathrm{eE}}{\mathrm{m}} \tau$ |
| $(D)$ Current Density | $(S)$ $\frac{E}{J}$ |
NEET 2021, Medium
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$J=\frac{I}{A}=n e v_{d}=\frac{n e^{2} \tau}{m} E=\sigma E=\frac{E}{\rho}$
$V_{d}=\frac{e E}{m} I ; \rho=\frac{m}{n e^{2} \tau}$ or $\rho=\frac{E}{J}, J=n e v_{d}$
$A \rightarrow R \quad B \rightarrow S \quad D \rightarrow Q$
$\tau=\frac{m}{n e^{2} \rho}$
$C \rightarrow P$
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