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Two identical wires A and B have same length L and carry the same current I

Two identical wires A and B have same length L and carry the same current I.Wire is bent into a circle of radius R and wire B is bent to form a square of side a.If B1 and B2 are the values geomagnetic induction at the centre of the circle and the centre of square respectively ,then the ratio ofB1/B2 is

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