Find magnetic field at $O$

131-134

  • A

    $\frac{{5{\mu _0}i\theta }}{{24\pi r}}$

  • B

    $\frac{{{\mu _0}i\theta }}{{24\pi r}}$

  • C

    $\frac{{11{\mu _0}i\theta }}{{24\pi r}}$

  • D

    Zero

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