Two concentric coplanar coils of turns \( n_{1} \) and \( n_{2} \) ...

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Two concentric coplanar coils of turns \( n_{1} \) and \( n_{2} \) have radii ratio \( 2: 1 \) respectively. Equal current in both the coils flows in opposite direction. If net magnetic field is zero at their common centre then \( n_{1}: n_{2} \) is :
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