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B0 is the magnetic field at point P for ...

`B_0` is the magnetic field at point `P` for a given straight wire as shown in figure. If this wirre is bent into a circular loop, then magnetic field at the centre of loop is

A

`sqrt 2pi B_0`

B

`(pi B_0)/(sqrt 2)`

C

`sqrt 2pi^2 B_0`

D

`(pi^2 B_0)/sqrt 2`

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