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[" 25.Two concentric circular coils "A" ...

[" 25.Two concentric circular coils "A" and "B" have radin "],[25cm" and "15cm" and carry currents "10A" and "15A],[" respectively.A has "24" turns and "B" has "18" turns.The "],[" direction of currents are in opposite order.The "],[" magnetic induction at the common centre of the coils "],[" is "],[[1)120 mu_(0)T," 2) "480 mu_(0)T],[" 3) "80 mu_(0)T," 4) "420 mu_(0)T]]

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