A square frame of side \( 1 \mathrm{~m} \) carries a current \( i \...

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A square frame of side \( 1 \mathrm{~m} \) carries a current \( i \), produces a magnetic field \( B \) at its centre. The same current is passed through a circular coil having the same perimeter as the square. The magnetic field at the centre of the circular coil is \( B^{\prime} \). The ratio \( B / B^{\prime} \) is
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