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What is the example of ferromagnetic materials is?

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in Design of Electrical Machines by (687k points)
What is the example of ferromagnetic materials is?

(a) Magnetite

(b) Hematite

(c) Nickel

(d) Biotite

This question was posed to me in semester exam.

My query is from Magnetic Materials topic in section Electrical Engineering Materials of Design of Electrical Machines

1 Answer

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The correct choice is (a) Magnetite

Easy explanation: Hematite denotes the example of antiferromagnetic materials. Nickel denotes an example of ferromagnetic materials. Biotite denotes the example of paramagnetic materials.

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