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A long wire carrying a steady current is...

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be

A

`2nB`

B

`2n^2B`

C

`nB`

D

`n^2B`

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