Which of the following is ferromagnetic.

Cu, Ag, Au

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Fe, Co, Ni

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Zn, Cd, Hg

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Ca, Sr, Ba

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Solution

The correct option is B Fe, Co, Ni
Ferromagnetic materials have a large, positive susceptibility to an external magnetic field. They exhibit a strong attraction to magnetic fields and are able to retain their magnetic properties after the external field has been removed. Ferromagnetic materials have some unpaired electrons so their atoms have a net magnetic moment. They get their strong magnetic properties due to the presence of magnetic domains.
Iron, nickel, and cobalt are examples of ferromagnetic materials. Components with these materials are commonly inspected using the magnetic particle method.

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