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What are the ferromagnetic elements used in the electromagnets?

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What are the ferromagnetic elements used in the electromagnets?

(a) iron

(b) nickel

(c) cobalt

(d) iron, nickel, cobalt

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Query is from Construction of Electromagnets in chapter Design of Electromagnets of Design of Electrical Machines

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Correct answer is (d) iron, nickel, cobalt

For explanation: The electromagnets consist of ferromagnetic core. The ferromagnetic materials include iron. nickel and cobalt.

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