NEET Physics Question - Magnetic Effects of Current

Assertion (A): Ferromagnetic materials of high retentivity are used to form permanent magnet.

Reason (R): Ferromagnetic materials have positive intensity of magnetisation.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

For a permanent magnet, the material must have high retentivity and high coercivity to retain magnetism. Ferromagnetic materials do exhibit positive intensity of magnetisation, which is true, but this general property is not the direct reason for choosing high retentivity for permanent magnets. Both A and R are true, but R is not the correct explanation of A.

Rankers Physics

Ferromagnetic Materials for Permanent Magnets

Solution:

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