On connecting a battery to the two corners of a diagonal of a square conductor frame of side $a$ the magnitude of the magnetic field at the centre will be
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From the figure, The magnetic field due to $AB , BC , CD$ and $DA$ is same at the center of the square.The magnetic field due to $AB$ and $BC$ is in inward direction, and magnetic field due to $CD$ and $DA$ is in outward direction,so, the net magnetic field at the center of the square is $zero.$
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