Match List-I with List-II
| List-I (Physical quantity) | List-II (Dimensions) |
| (A) Mutual inductance | (I) [ML2T-3A-1] |
| (B) Magnetic flux | (II) [M0T0L2A] |
| (C) EMF | (III) ML2T-2A-1 |
| (D) Magnetic moment | (IV) ML2T-2A-2 |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A) - (IV), (B) - (III), (C) - (I), (D) - (II)
Build each dimension from a defining relation, starting from force [MLT−2], energy [ML2T−2] and charge [AT].
(A) Mutual inductance — this matches (IV) ML2T-2A-2. Mutual inductance is the flux linked per unit current, \( M = \phi/I \), so it has the dimensions of flux divided by current.
\( \displaystyle [M] = \frac{[\mathrm{ML^{2}T^{-2}A^{-1}}]}{[\mathrm{A}]} = [\mathrm{ML^{2}T^{-2}A^{-2}}] \)
(B) Magnetic flux — this matches (III) ML2T-2A-1. Flux is \( \phi = BA \), and B follows from the force on a current, \( F = BIl \).
\( \displaystyle [B] = \frac{[\mathrm{MLT^{-2}}]}{[\mathrm{A}][\mathrm{L}]} = [\mathrm{MT^{-2}A^{-1}}] \)
\( \displaystyle [\phi] = [\mathrm{MT^{-2}A^{-1}}][\mathrm{L^{2}}] = [\mathrm{ML^{2}T^{-2}A^{-1}}] \)
(C) EMF — this matches (I) [ML2T-3A-1]. EMF is work done per unit charge.
\( \displaystyle [\varepsilon] = \frac{[\mathrm{ML^{2}T^{-2}}]}{[\mathrm{AT}]} = [\mathrm{ML^{2}T^{-3}A^{-1}}] \)
(D) Magnetic moment — this matches (II) [M0T0L2A]. A current loop has magnetic moment \( m = IA \), current times area, so its dimensions are [L2A].