Question
Which of the following materials has the highest temperature stability of its magnetic characteristics?
Answer Options
- A) Brass
- B) Powdered iron
- C) Ferrite
- D) Aluminum
Correct Answer: B
Explanation
Temperature stability is the property of a core material to maintain its magnetic permeability and characteristics despite changes in ambient temperature. This stability is critical for the reliable operation of tuned circuits, filters, and oscillators, where temperature-induced drift can cause the resonant frequency to shift.
Between the common magnetic core materials, Powdered iron has the highest temperature stability of its magnetic characteristics. Ferrite, while having higher permeability, is a ceramic compound whose permeability changes significantly with temperature, making powdered iron the preferred choice for coils and inductors requiring high frequency stability, especially in radio frequency applications.
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