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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 1 turn and 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

`nB`

B

`n^2B`

C

`ZnB`

D

`2n^2B`.

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