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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 cor

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?

 

 

 

 
 
 
 
 

Answers (1)

B=\frac{\mu _{0}\; \mu _{r}\; NI}{2\pi r}

    =\frac{4\pi \times 10^{-7}\times 800\times 4000\times 3}{2\pi \times 20\times 10^{-2}}

    =9.6 \; T

Bismuth is a diamagnetic material which decreases the magnetic field lines in the core.

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Safeer PP

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