Question

if a torroid uses bismuth for it's core will the field in the core be greater or lesser than when the core is empty?

Answer 1

Here is your answer.

The magnetic field will decrease in the torroid when bismuth is present as its core.

Cause:

=> Bismuth is a diamagnetic substance. So, magnetic lines of force will not like to go through the core. So, magnetic lines of force will decrease inside the torroid and the magnetic field will also decrease.

Hope the answer will help you.

Answer 2

${\bf{\underline{\underline{Answer:}}}}$

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A toroid using bismuth core has a magnetic field slightly greater than a toroid whose core is empty because bismuth is a diamagnetic substance.

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