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Magnetics question

2004 · Shift 0 · Q142
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Magnetics question

2004 · Shift 0 · Q142

JEE MainPhysicsMagneticsMCQ+4 / −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.B.B. It is then bent into a circular loop of nnn turns. The magnetic field at the center of the coil will be
  1. A
    2nB2nB2nB
  2. B
    n2 B{n^2}\,Bn2B
  3. C
    nBnBnB
  4. D
    2n2 B2{n^2}\,B2n2B
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