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A toroid has a core( non-ferromagnetic) of inner radius 25 cm and outer radius 26cm, around which 3500 turns of a wire wound. If the current in the wires is 11A, what is the magnetic field inside the core of the toroid, and

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`B=mu_(0)(NI)/(2pir)=(4pixx10^(-7)xx3500xx11)/(2pixx25.5xx10^(-2))`
[Here `r=(25+26)/(2)=25.5 cm`]
`=3.02xx10^(-2)T`.
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