Electrical Engineering XYZ MCQs

Eddy current loss depends on:

- Flux density
- Thickness
- Frequency
- All of the above

Correct answer: 4. All of the above

Explanation: Eddy current loss, also known as core loss, occurs in electrical conductors when they are exposed to changing magnetic fields. These currents create heat due to the resistance of the material. The magnitude of eddy current loss depends on several factors:

- Flux density: Eddy current loss is directly proportional to the square of the flux density (B). Higher flux densities result in higher eddy current losses.
- Thickness: Eddy current loss is inversely proportional to the thickness of the conductor (t). Thicker conductors experience lower eddy current losses because there is more material to spread out the induced currents.
- Frequency: Eddy current loss is directly proportional to the frequency (f) of the changing magnetic field. Higher frequencies induce more rapid changes in the magnetic field, resulting in higher eddy current losses.

Therefore, all three factors – flux density, thickness, and frequency – influence the magnitude of eddy current loss. So, the correct answer is “All of the above.”