A soft iron toroid is concentric with a long straight conductor carryi – McqOptions

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1.	A soft iron toroid is concentric with a long straight conductor carrying a dc of I A. If μr of soft-iron is 100, find the ratio of magnetic flux densities at two adjacent points located just inside and just outside the toroid.
A.	100
B.	200
C.	50
D.	500
Answer» B. 200

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