Which of the following is a ferromagnetic magnetic material? a) diamond b) aluminum c) copper d) iron

D) iron

Explanation:

Iron, nickel, cobalt and some of the rare earths (gadolinium, dysprosium) exhibit a unique magnetic behavior which is called ferromagnetism because iron (ferrum in Latin) is the most common and most dramatic example. ... There are many practical applications of ferromagnetic materials, such as the electromagnet.

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