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

1. (A)–(R), (B)–(Q), (C)–(S), (D)–(P)
2. (A)–(R), (B)–(S), (C)–(P), (D)–(Q)
3. (A)–(R), (B)–(S), (C)–(Q), (D)–(P)
4. (A)–(R), (B)–(P), (C)–(S), (D)–(Q)

Correct answer: (A)–(R), (B)–(S), (C)–(Q), (D)–(P)

Solution

The standard relations are: drift velocity \(v_d = \frac{I}{neA}\), resistivity \(\rho = \frac{m}{ne^2\tau}\), relaxation time \(\tau\) is related to microscopic motion through conductivity/mobility, and current density \(J = \sigma E\). Matching the given labels leads to option (B).

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