A square frame of side l carries a curre...

A square frame of side `l` carries a current produces a field `B` at its centre. The same current is passed through a circular loop having same perimeter as the square. The field at its centre is `B'`, the ratio of `B//B'` is

`(8sqrt(2))/(pi^(2))`

`(8sqrt(2))/(pi^(3))`

`(8sqrt(2))/(pi)`

`(4sqrt(2))/(pi^(2))`

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