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[" 19.Two concentric circular coils of "...

[" 19.Two concentric circular coils of "10" turns each are "],[" situated in the same plane.Their radii are "20cm],[" and "40cm" and they carry respectively "0.2A" and "],[0.3A" current in opposite direction.The magnetic "],[" field in Whm " at the centre is "]

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