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A current of I ampere flows in a wire forming a circular arc of radius \( \mathrm{r} \) metres subtending an angle \( \theta \) at the centre as shown. The magnetic field at the centre \( \mathrm{O} \) in tesla is
(a) \( \frac{\mu_{0} \mathrm{I} \theta}{4 \pi \mathrm{r}} \)
(b) \( \frac{\mu_{0} I \theta}{2 \pi r} \)
(c) \( \frac{\mu_{0} I \theta}{2 r} \)
(d) \( \frac{\mu_{0} I \theta}{4 r} \)
\( \mathrm{W} \)
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