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Magnetic field at the centre $O$ due to the given structure is
  • A$\frac{\mu_0 l}{4 R}\left[\frac{3}{2}+\frac{1}{\pi}\right] \odot$
  • B$\frac{\mu_0 I}{2 R}\left[3+\frac{1}{\pi}\right] \otimes$
  • C$\frac{\mu_0 I}{4 R}\left[\frac{3}{2}+\frac{1}{\pi}\right] \otimes$
  • D$\frac{\mu_0 l}{4 R}\left[3+\frac{2}{\pi}\right] \odot$
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