Match List - I with List - II.
| List - I | List - II | ||
| (Physical Quantity) | (S.I. unit) | ||
| (A) | Linear charge density | (I) | Newton (metre)2 / coulomb |
| (B) | Electric dipole moment | (II) | Coulomb / metre |
| (C) | Polarisation vector | (III) | Coulomb / (metre)2 |
| (D) | Electric flux | (IV) | Coulomb – metre |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(II), (B)-(IV), (C)-(III), (D)-(I)
The unit of each quantity follows from its defining relation.
(A) Linear charge density — this matches (II) Coulomb / metre. It is the charge per unit length, \( \lambda = q/l \).
(B) Electric dipole moment — this matches (IV) Coulomb – metre. It is the charge times the separation, \( p = q \times 2a \).
(C) Polarisation vector — this matches (III) Coulomb / (metre)2. Polarisation is the dipole moment per unit volume, so its unit is \( \mathrm{C\,m}/\mathrm{m^{3}} = \mathrm{C\,m^{-2}} \).
(D) Electric flux — this matches (I) Newton (metre)2 / coulomb. Flux is field times area, \( \Phi = E\,S \), with \( E \) in \( \mathrm{N\,C^{-1}} \) and \( S \) in \( \mathrm{m^{2}} \).