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A straight wire of length (2pi^(2)) metr...

A straight wire of length `(2pi^(2))` metre is carrying a current of `2A` and the magnetic field due to it is measured at a point distant `1 cm` from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be

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