A current $I$ flowing through the loop as shown in the adjoining figure. The magnetic field at centre $O$ is
A current $I$ flowing through the loop as shown in the adjoining figure. The magnetic field at centre $O$ is
- A
$\frac{{7{\mu _0}I}}{{16R}} \otimes $
- B
$\frac{{7{\mu _0}I}}{{16R}} \odot $
- C
$\frac{{5{\mu _0}I}}{{16R}} \otimes $
- D
$\frac{{5{\mu _0}I}}{{16R}} \odot $
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