Match the following List-I and List-II
| List-I | List-II | ||
|---|---|---|---|
| (A) | Faraday’s Law | (I) | Direction of induced current |
| (B) | Lenz’s Law | (II) | Changing of voltage |
| (C) | Generator | (III) | Magnitude of emf |
| (D) | Transformer | (IV) | Production of induced a.c. |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
Each law or device is matched to the one thing it describes or does in electromagnetic induction.
(A) Faraday’s Law — this matches (III) Magnitude of emf. The induced emf equals the rate of change of flux, \( |e| = d\phi/dt \).
(B) Lenz’s Law — this matches (I) Direction of induced current. The induced current flows so as to oppose the change producing it.
(C) Generator — this matches (IV) Production of induced a.c. A coil rotating in a magnetic field has an alternating emf induced in it.
(D) Transformer — this matches (II) Changing of voltage. It steps an a.c. voltage up or down by mutual induction.
NCERT (2026-27):
Faraday’s Law of Induction – “… The magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit.”
Lenz’s Law and Conservation of Energy – “In 1834, German physicist Heinrich Friedrich Lenz (1804-1865) deduced a rule, known as Lenz’s law which gives the polarity of the induced emf in a clear and concise fashion.”
AC Generator – “… An exceptionally important application is the generation of alternating currents (ac).”
Transformers – “For many purposes, it is necessary to change (or transform) an alternating voltage from one to another of greater or smaller value. This is done with a device called transformer using the principle of mutual induction.”