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A toroid of non ferromagnetic has core o...

A toroid of non ferromagnetic has core of inner radius `25cm` and outer radius `26cm`. It has 3500 turns `&` carries a current of `11A`, then find the magnetic field at a point
`(i)` In the internal cavity of toroid
`(ii)` At the midpoint of the windings
`(iii)` At a point which is at a distance of `30cm` from the centred of toroid.

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