If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?

If a toroid uses bismuth for its core, will the field in the core be (

1.	If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?
Answer» Solution :(C) Since bismuth is diamagnetic, MAGNETISATION is obtained OPPOSITE to magnetising field. HENCE, resultant magnetic field obtained in a toroid FILLED with bismuth will be less than that in empty toroid.

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If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty?

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