Match the LIST-I with LIST-II
| LIST-I Quantity | LIST-II Formula | ||
| A. | Electromotive force | I. | Drift velocity / Electric field |
| B. | Electric field | II. | Current / Area |
| C. | Current density | III. | Electric force / Charge |
| D. | Charge mobility | IV. | Work / Charge |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-IV, B-III, C-II, D-I
Each quantity is matched by its defining relation.
(A) Electromotive force — this matches (IV) Work / Charge. The emf is the work done per unit charge by the source in taking charge round the circuit, \( \varepsilon = W/q \).
(B) Electric field — this matches (III) Electric force / Charge. The field is the force per unit positive test charge, \( E = F/q \).
(C) Current density — this matches (II) Current / Area. It is the current per unit area normal to the flow, \( j = I/A \).
(D) Charge mobility — this matches (I) Drift velocity / Electric field. Mobility is the drift speed per unit field, \( \mu = v_d/E \).
NCERT (2026-27):
Summary – …
