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An iron ring has a mean diameter of 0.1 m and a cross-section of 33.5 × 10 − 6 m2. It is wound with a magnetising winding of 320 turns and the secondary winding of 220 turns. On reversing a current of 10 A in the magnetising winding, a ballistic galvanometer gives a throw of 272 scale divisions, while a Hilbert Magnetic standard with 10 turns and a flux of 2.5 × 10 − 4 gives a reading of 102 scale divisions, other conditions remaining the same. Find the relative permeability of the specimen.
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