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A thin insulated wire forms a plane spir...

A thin insulated wire forms a plane spiral of `N=100` tight turns carrying a current `I=8 mA`.The radii of inside and outside turns (figure) are equal to `a=50 mm` and `b=100 mm`.
(a)The magnetic induction at the centre of the spiral is `N muT`.Then find value of `N`.
(b)The magnetic moment of the spiral with a given current is `N mA m^(2)`.Then find value of `N`.

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