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Asked in GSEB Board July 2016 · Magnetisation, intensity and susceptibility
Given: μᵣ=0.075.
Idea: the two constants are tied together by μᵣ=1+χ, which follows from B=μ₀(H+M) with M=χ H.
So χ=μᵣ-1=0.075-1=-0.925.
The sign is the physics: μᵣ<1 means the material weakens the field inside it, which is diamagnetic behaviour, and a diamagnetic susceptibility must be negative.
So the magnetic susceptibility is -0.925.
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