Match List - I with List - II.
| List - I | List - II |
| (A) Eddy currents | (I) Transformer |
| (B) Self Induction | (II) Obeys the principle of conservation of Energy |
| (C) Lenz's Law | (III) Electromagnetic damping |
| (D) Mutual Induction | (IV) AC Generator |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
All four items are parts of electromagnetic induction: an emf is induced whenever the magnetic flux linked with a circuit changes.
(A) Eddy currents — this matches (III) Electromagnetic damping. When a metal plate or a coil frame moves in a magnetic field, eddy currents are induced in it and oppose its motion, so the motion dies out quickly. Galvanometer coils are wound on metal frames for this reason.
(B) Self Induction — this matches (IV) AC Generator, the entry left after the other three. The rotating coil of an AC generator carries a current that keeps changing, and its own self-inductance opposes that change.
(C) Lenz's Law — this matches (II) Obeys the principle of conservation of Energy. The induced current opposes the change that produces it, so work must be done to keep the flux changing; if it aided the change, energy would be created from nothing.
(D) Mutual Induction — this matches (I) Transformer. A changing current in the primary coil induces an emf in the secondary coil wound on the same core.