In the figure, what is the magnetic field at the point $O$
In the figure, what is the magnetic field at the point $O$
- A
$\frac{{{\mu _0}I}}{{4\pi r}}$
- B
$\frac{{{\mu _0}I}}{{4\pi r}} + \frac{{{\mu _0}I}}{{2\pi r}}$
- C
$\frac{{{\mu _0}I}}{{4r}} + \frac{{{\mu _0}I}}{{4\pi r}}$
- D
$\frac{{{\mu _0}I}}{{4r}} - \frac{{{\mu _0}I}}{{4\pi r}}$
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