The region inside a current carrying toroid winding is filled with Aluminium having susceptibility χ=2.3×10^−5. What is the percentage increase in the magnetic field in the presence of Aluminium over that without it?

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The region inside a current carrying toroid winding is filled with Aluminium having susceptibility χ=2.3×10⁻⁵. What is the percentage increase in the magnetic field in the presence of Aluminium over that without it?

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