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Oxides and Oxoanions

In a cassette...

Question

In a cassette player, material used for coating magnetic tapes is :

A

cobalt

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B

C o {F e}_{2} O_{4}

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C

N i {F e}_{2} O_{4}

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D

nickel

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Solution

The correct option is C $N i {F e}_{2} O_{4}$
In cassette player, materials used for magnetic tapes is $N i {F e}_{2} O_{4} .$
Ferrites (Ferromagnetic material) is used for Coating magnetic tapes. In cassette player or for building memory store in modern computers. Most common ones are $M n F e_{2} 0_{4}, F e F e_{2} 0_{4}, N i F e_{2} 0_{4}$ etc.
Hence, the answer is $N i F e_{2} 0_{4} .$

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Q. Answer the following questions:
(a) Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet.
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(c) 'A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory? Explain the meaning of this statement.
(d) What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building 'memory stores' in a modern computer?
(e) A certain region of space is to be shielded from magnetic fields. Suggest a method.

Q. The access method used for cassette tape is __________.

Q. List - 1 List - 2

A) Antiferromagnetic 1)

{N i F e}_{2} O_{4}

B) Covalent crystal 2)

M n O

C) Ferrimagnetic 3) Diamond

The correct match is :

Cobalt, nickel and _______ are magnetic materials.

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