A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetizing current of 1.2 A?
(1) 3.27 T
(2) 2.56 T
(3) 1.05 T
(4) 4.48 T
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