Question

If a toroid uses bismuth for its core, the field in the core
compared to that in empty core will be slightly
(a) greater (b) smaller
(c) equal (d) None of these

Answer 1

Answer:

(b) smaller

Explanation:

As Bismuth is a diamagnetic substance, when used in a core of a toroid the field in the toroid becomes slightly less than when the core is empty.

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