Explain it properly

Explain it properly A toroid is filled with liquid oxygen that has a susceptibility of 4 X 10-3. The toroid has 2000 turns and carries a current of 15A. Its mean radius is 20 cm, and the radius of its cross section is 0.8 cm.What is the percentage increase in B produced by the liquid oxygen ? (2) 0.4% (3) 2% (4) 1.8 %

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