Ferrite is used for making very powerful permanent magnets. It is a mixture of :

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Ferric oxide and copper oxide

Ferric oxide and barium oxide

Ferric oxide and zinc oxide

Ferric oxide and aluminum oxide

answer is C.

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Detailed Solution

Ferrites that are used in transformer or electromagnetic cores contain iron oxides

combined with nickel, zinc, and/or manganese compounds. They have a low coercivity and

are called "soft ferrites" to distinguish them from "hard ferrites", which have a high coercivity

and are used to make ferrite magnets

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