If there is circular coil having 'n' turns, the field produced is 'n' times as large as that produced by a single turn. Why?
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It is because field produced by a single coil in the perpendicular direction is B. Since there are n circular coils producing the same magnetic field and in the same direction as well their total magnetic field gets added up as B + B + B + (n times) = nB
Thus total field becomes nB
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