Diamagnetism and Hard Magnetic Materials – Rankers Physics
Topic: Magnetic Effects of Current
Subtopic: Magnetic Properties of Matter

Diamagnetism and Hard Magnetic Materials

Assertion (A): The permanent magnetic moment of the atoms of a material is zero. The material must be diamagnetic.
Reason (R): Hard magnetic materials have high retentivity, high coercivity and large hysteresis- loss and are suitable for permanent magnetism.
 
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution:

Diamagnetic materials are characterized by the absence of permanent atomic magnetic moments, making Assertion (A) true. Hard magnetic materials need high retentivity and coercivity for permanent magnetism, making Reason (R) true. However, the two statements describe different properties and are not causally related.

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