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Physics · PYQ NEET UG 2021
हिन्दीMatch List-I with List-II: List-I List-II A Drift Velocity P \( \frac{m}{ne^2\rho} \) B Electrical Resistivity Q \( nev_d \) C Relaxation Period R \( \frac{eE}{m}\tau \) D Current Density S \( \frac{E}{J} \)
Match List-I with List-II:
| List-I | List-II | ||
|---|---|---|---|
| A | Drift Velocity | P | \( \frac{m}{ne^2\rho} \) |
| B | Electrical Resistivity | Q | \( nev_d \) |
| C | Relaxation Period | R | \( \frac{eE}{m}\tau \) |
| D | Current Density | S | \( \frac{E}{J} \) |
Correct answer · Option 4
(A) - (R), (B) - (S), (C) - (P), (D) - (Q)
Explanation
Drift velocity \( v_d = \frac{eE\tau}{m} \) (R), Resistivity \( \rho = \frac{m}{ne^2\tau} = \frac{E}{J} \) so \( \rho = \frac{E}{J} \) gives (S), Relaxation period \( \tau = \frac{m}{ne^2\rho} \) (P), Current density \( J = ne v_d \) (Q). Hence, (A)-(R), (B)-(S), (C)-(P), (D)-(Q).
