Question
Why are cores of inductors and transformers sometimes constructed of thin layers?
Answer Options
- A) To simplify assembly during manufacturing
- B) To reduce power loss from eddy currents in the core
- C) To increase the cutoff frequency by reducing capacitance
- D) To save cost by reducing the amount of magnetic material
Correct Answer: B
Explanation
When an AC magnetic field passes through a conductive core material (like iron or steel), the field induces small, circular currents within the core mass, known as eddy currents. These eddy currents dissipate energy as heat, causing power loss and reduced efficiency in transformers and inductors, especially at higher frequencies.
To combat this, the cores are often constructed of thin layers (laminations) of highly resistive material that are insulated from one another. This technique forces the induced eddy currents to flow only in restricted, narrow loops within each thin layer, significantly increasing the resistance to their flow and thereby reducing power loss from eddy currents in the core.
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