Match List I with List II
| LIST I | LIST II |
| A. AC generator | I. Michael Faraday |
| B. Polarity of induced emf | II. Foucault |
| C. Electromagnetic Induction | III. Nikola Tesla |
| D. Eddy current | IV. Heinrich Friedrich Lenz |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-III, B-IV, C-I, D-II
Each item is a discovery or device in electromagnetic induction, matched with the scientist who gave it.
A. AC generator — this matches III. Nikola Tesla. The modern ac generator was developed by Tesla; it turns mechanical energy into electrical energy by rotating a coil in a magnetic field.
B. Polarity of induced emf — this matches IV. Heinrich Friedrich Lenz. Lenz's law gives the direction (polarity) of the induced emf: it opposes the change in flux that produces it.
C. Electromagnetic Induction — this matches I. Michael Faraday. Faraday's experiments showed that a changing magnetic flux induces an emf, and his law gives its size, \( \varepsilon = -d\Phi/dt \).
D. Eddy current — this matches II. Foucault. Currents induced in bulk metal pieces by changing flux were discovered by Foucault, and are also called Foucault currents.