$A$ current $I$ flows in a circular arc of radius $r$ subtending an angle $\theta$ at the centre $O$ as shown in the figure. Find the magnetic field at the centre $O$ of the circle.
- A$\frac{\mu_0 I \theta}{4 \pi r}$
- B$\frac{2 \mu_0 I \sin \theta}{4 \pi r}$
- C$\frac{2 \mu_0 I \sin \theta}{2 r}$
- D$\frac{2 \mu_0 I \sin \theta}{4 r}$
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