JEE Main 2025 Apr 2 Shift 1, Physics Q10: Magnetism and Matter

JEE Main2025Apr 2, Shift 1Physics

The relationship between the magnetic susceptibility $(χ)$ and the magnetic permeability $(μ)$ is given by :

$(μ_{0}$ is the permeability of free space and $μ_{r}$ is relative permeability)

Solution

Two standard relations are needed.

Relation 1: $μ_{r} = 1 + χ$ , so $χ = μ_{r} - 1$ .

Relation 2: $μ = μ_{0} μ_{r}$ , so $μ_{r} = \frac{μ}{μ _{0}}$ .

Combining:

$χ = \frac{μ}{μ _{0}} - 1$

$∴$ Option (1) is correct.

Concept behind this question

Concept-wise practice with instant solutions on Fundamenthol.