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

Question

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 see adjacent figure are equal to a 50 mm and b 100 mm Find a the magnetic induction at the centre of the spiral b the magnetic moment of the spiral with a given current

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