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A Rowland ring of mean radius 15 cm has ...

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 magnetising current of 1.2 A?

A

5.76 tesla

B

4.48 tesla

C

0.39 oersted

D

5.76 oersted

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