In the figure, shown the magnetic induction at the centre of there $arc$ due to the current in portion $AB$ will be

128-20

  • A

    $\frac{{{\mu _0}i}}{r}$

  • B

    $\frac{{{\mu _0}i}}{{2r}}$

  • C

    $\frac{{{\mu _0}i}}{{4r}}$

  • D

    Zero

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