Extra exam question E6D05
Subelement E6, CIRCUIT COMPONENTS· Group E6D
How do ferrite and powdered iron compare for use in an inductor core?
- A.Ferrite cores generally have lower initial permeability
- B.Ferrite cores generally have better temperature stability
- C.Ferrite cores generally require fewer turns to produce a given inductance value (correct answer)
- D.Ferrite cores are easier to use with surface-mount technology
WhyFerrite cores generally require fewer turns than powdered iron cores to produce a given inductance value. Ferrite generally has much higher permeability than powdered iron, so a ferrite core typically needs fewer turns of wire to reach a given inductance value than a powdered iron core of similar size would, answer C. Ferrite doesn't have lower initial permeability, that's backwards, and better temperature stability and easier surface-mount use aren't the standard comparison points between these two core materials.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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