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A cell is connected between the points \( \mathrm{A} \) and \( \mathrm{C} \) of a circular conductor \( \mathrm{ABCD} \) of centre \( \mathrm{O} \) with angle \( \mathrm{AOC}=60^{\circ} \). If \( \mathrm{B}_{1} \) and \( \mathrm{B}_{2} \) are the magnitudes of the magnetic fields at \( \mathrm{O} \) due to the currents in \( \mathrm{ABC} \) and \( A D C \), respectively, the ratio \( B_{1} / B_{2} \) is
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