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Two substances A and B have relative per...

Two substances A and B have relative permeabilities slightly greater and less than unity respectively. What is their magnetic nature?

Text Solution

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`mu_r=1+chi` or `chi=mu_r-1`
For A, `mu_rgt1`
`:. chi` is small and positive.
It must be paramagnetic.
For B, `mu_rlt1`
`:. chi` is small and negative.
Hence, B must be diamagnetic.
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