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[" 1.A long wire carries a steady curren...

[" 1.A long wire carries a steady current.It is bent into a circle of one turn and the magnetic "],[" field at the centre of the coil is "B" .It is then bent into a circular loop of "n" turns.The "],[" magnetic field at the centre of the coil will be [Jamia Millia Islamia "2007]],[[" 1) "nB," 2) "n^(2)B],[" 3) "2nB," 4) "2n^(2)B]]

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