The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and ε is a small positive number) is (a) μ < μ₀ (b) 0 ≤ μr < 1 (c) -1 ≤ χ < 0 (d) 1 < μr < 1 + ε

Answer: (d). For a diamagnetic material -1 ≤ χ < 0, so μr = 1 + χ lies in 0 ≤ μr < 1 and μ < μ₀. So (a), (b), (c) are correct relations. 1 < μr < 1 + ε is true for a paramagnetic material, not a diamagnetic one. So the answer is (d).

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Magnetic Materials & Curie Law

The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and $\varepsilon$ is a small positive number) is

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Answer: (d)

For a diamagnetic material $-1 \le \chi < 0$ , so $\mu_r = 1 + \chi$ lies in $0 \le \mu_r < 1$ and $\mu < \mu_0$ .
So (a), (b), (c) are correct relations.
$1 < \mu_r < 1 + \varepsilon$ is true for a paramagnetic material, not a diamagnetic one.
So the answer is (d).

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