A toroidal solenoid of mean radius 20 cm has 4000 turns of wire wound on a ferromagnetic core of relative permeability 800. Calculate the magnetic field in the core for a current of 3 A passing through the coil. How does the field change, when this core is replaced by a core of Bismuth ?

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A toroidal solenoid of mean radius 20 cm has 4000
turns of wire wound on a ferromagnetic core of
relative permeability 800. Calculate the magnetic
field in the core for a current of 3 A passing
through the coil. How does the field change, when
this core is replaced by a core of Bismuth ?
Transcribed Image Text:A toroidal solenoid of mean radius 20 cm has 4000 turns of wire wound on a ferromagnetic core of relative permeability 800. Calculate the magnetic field in the core for a current of 3 A passing through the coil. How does the field change, when this core is replaced by a core of Bismuth ?
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