The magnetic field intensity at the point $O$ of a loop with current $i$, whose shape is illustrated below is

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  • A

    $\frac{\mu_0 i}{4 \pi}\left[\frac{3 \pi}{2 a}+\frac{\sqrt{2}}{b}\right]$

  • B

    $\frac{\mu_0 i}{4 \pi^2}\left[\frac{2}{a}+b\right]$

  • C

    $\frac{\mu_0 i}{2 \pi}\left[\frac{1}{a}+\frac{1}{b}\right]$

  • D

    $\frac{\mu_0 i}{4 \pi}\left[\frac{1}{a}+\frac{1}{b}\right]$

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