Diamagnetic Permeability – Rankers Physics

Magnetic Properties of Matter: Practice Problem & Solution

Assertion (A): For a perfectly diamagnetic substance, permeability is always 1. Reason (R): Small pieces of any magnetic substance are attracted by a strong magnetic field.  
(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

Short Solution (Best for NEET):

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:

For a perfectly diamagnetic substance (e.g., superconductor), its relative magnetic permeability \(mu_r\) is 0, not 1. Diamagnetic substances are weakly repelled by magnetic fields, not attracted. Therefore, both Assertion (A) and Reason (R) are false.

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