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A long wire carries a steady current. It...

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 :

A

n B

B

`n^2B`

C

2nB

D

`2n^2B`

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