Hysteresis and Magnetic Memory – Rankers Physics

Magnetic Properties of Matter: Practice Problem & Solution

Assertion (A): A system displaying a hysteresis loop, such as a ferromagnet is a device for storing memory. Reason (R): A ferromagnetic substance remains magnetised even after external field is removed.  
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 Explained:

To solve this problem, we apply the core principles of Magnetic Properties of Matter. Understanding the underlying formula is key to arriving at the correct answer below:

Hysteresis means a material retains magnetization (retentivity) when the external field is removed. This residual magnetism allows the material to 'remember' its magnetic state, forming the basis of magnetic memory. Thus, Reason (R) correctly explains Assertion (A).

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