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प्रश्न
A thin insulated wire forms a plane spiral of N = 100 tight turns carrying a current 1 = 8 m A (milli ampere). The radii of inside and outside turns are a = 50 mm and b = 100 mm respectively. The magnetic induction at the center of the spiral is
पर्याय
5 μT
7 μT
8 μT
10 μT
उत्तर
7 μT
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