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A Rowland ring of mean radius 16 cm has ...

A Rowland ring of mean radius 16 cm has 4000 turns of wire wound on a ferromagnetic core of relative permeability 800 . What is magnetic field in the core for a magnetising current of 1.2 A ?

Text Solution

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`B = (mu _(0) mu_(r 2Ni)/(4pi r )`
`B= (10 ^(-7) xx 800 xx 2xx 4000xx1.2)/(16 xx 10 ^(-2))`
`B = (8xx2 xx 4xx1.2)/(16)`
` B = 4.8T.`
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