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Which of the following is an example of soft magnetic material?

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Which of the following is an example of soft magnetic material?

(a) Permalloy

(b) Strontium

(c) Alnico

(d) Neodymium

This question was posed to me in an international level competition.

This intriguing question comes from Soft and Hard Magnetic Materials topic in division Magnetic & Insulating Materials of Engineering Material & Metallurgy

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The correct option is (a) Permalloy

To explain I would say: Permalloy is a soft magnet mainly used in electrical and electronic applications. It is composed of roughly 45% nickel. It has a high relative permeability of around 2700.

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