When a certain length of wire is turned ...

When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is `B_(1)` If the same wire is turned into three loops to make a circular coil, the magnetic induction at the center of this coil for the same current will be

`B_(1)`

`9B_(1)`

`3B_(1)`

`27B_(1)`

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