A square frame of side \( I \) carries a current \( i \). The magne...

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