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 coils of n turns will be

Options

(a) nB
(b) n²B
(c) 2nB
(d) 2n²B

Correct Answer:

n²B

Explanation:

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