A straight wire of length (pi^(2)) metre...

A straight wire of length `(pi^(2))` metre is carrying a current of 2 A and the magnetic field due to is measured at a point distance 1cm from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be

`50: 1`

`1:50`

`100:1`

` 1:100 `

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