Match List-I with List-II
| List-I | List-II |
| Formula | Physical Quantity |
| (A) \( \varepsilon = -L\displaystyle\frac{dI}{dt} \) | (I) Self inductance |
| (B) \( \varepsilon = -M\displaystyle\frac{dI}{dt} \) | (II) Mutual inductance |
| (C) \( L = \displaystyle\frac{\phi}{I} \) | (III) Mutual Induced emf |
| (D) \( M = \displaystyle\frac{\phi_2}{I_1} \) | (IV) Self Induced emf |
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) - (I), (D) - (II)
A formula with \( \varepsilon \) on the left gives an induced emf; a formula of the form flux divided by current defines an inductance. The letter \( L \) belongs to a single coil and \( M \) to a pair of coils.
(A) \( \varepsilon = -L\,dI/dt \) — this matches (IV) Self Induced emf. The emf is induced in a coil by the change of its own current.
(B) \( \varepsilon = -M\,dI/dt \) — this matches (III) Mutual Induced emf. The emf is induced in one coil by the change of current in the neighbouring coil.
(C) \( L = \phi/I \) — this matches (I) Self inductance. It is the flux linked with a coil per unit current in the same coil.
(D) \( M = \phi_2/I_1 \) — this matches (II) Mutual inductance. It is the flux linked with coil 2 per unit current in coil 1.
NCERT (2026-27):
Summary – …
