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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)

1. χ = μ r + 1
2. χ = 0 μ μ – 1
3. χ = 0 μ μ + 1
4. χ = 1 – 0 μ μ

Correct answer: χ = 0 μ μ – 1

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