NEET Physics Question - Magnetic Effects of Current

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

Solution:

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.

Rankers Physics

Diamagnetic Permeability

Solution:

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