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A Rowland rign of mean radius 18cm has 3...

A Rowland rign of mean radius `18cm` has `3500` turns of wire wound on a ferromagnetic core of relative permeability `800`. What is the magnetic field in the core for a magnetising current of `1*2amp`.?

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SL ARORA-MAGNETISM-Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet
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