66 A ring of mean radius 15 cm has 3500 turns of wire wound on...

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66 A ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800 The magnetic field in the core for a magnetising current of 1 2 A is a 2 48 T b 3 48 T d 5 48 T c 4 48 T 67 A solenoid has a core of a material with relative

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