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The magnetic field at the centre of a ci...

The magnetic field at the centre of a circular coil carrying current I-ampere is B. If the coil bent into smaller circular coil of n turns, its magnetic field at the centre is B. The ratio between B’ and B is:

A

`1:1`

B

`n:1`

C

`n^2:1`

D

`2n:1`

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