Find out magnetic field at point $O$ ?

824-405

  • A

    $\pi\times {10^{ - 5}}\,T$

  • B

    $\pi\times {10^{ - 4}}\,T$

  • C

    $\pi\times {10^{ - 1}}\,T$

  • D

    ${10^{ - 5}}\,T$

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