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Ferromagnetism

Alnico is use...

Question

Alnico is used for making permanent magnets because it has

A

High coercivity and high retentivity

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B

high coercivity and low retentivity

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C

low coercivity and low retentivity

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D

low coercivity and high retentivity

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Solution

The correct option is A High coercivity and high retentivity
Alnico is used for making permanent magnet because it can be easily magnetised in external magnetic field and It will not lose its magnetic property due to its high coercivity and low retentivity.

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Similar questions

Q. The desirable properties for making permanent magnets are
(a) high retentivity and high coercive force
(b) high retentivity and low coercive force
(c) low retentivity and high coercive force
(d) low retentivity and low coercive force

Q. Electromagnets are made of soft iron because soft iron has
(a) high retentivity and high coercive force
(b) high retentivity and low coercive force
(c) low retentivity and high coercive force
(d) low retentivity and low coercive force

Q. In the given question, a statement of Assertion

(A)

is given, followed by a corresponding statement of Reason

(R)

just below of it. Mark the correct answer.

Assertion

(A)

: AlNiCo is used for making permanent magnets.

Reason

(R)

: It has a high retentivity and high coercivity.

Q. Permanent magnet has properties retentivity and coercivity respectively as:

Q. The figure gives experimentally measured

B - H

variation in a ferromagnetic material. Its retentivity, coercivity and saturation magnetization, respectively are:

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