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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. It the coil is bent into smaller circular coil of n turns then 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

`(n+1):1`

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The correct Answer is:
C
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