$A$ circular arc of wire of radius of curvature $r$ subtends an angle of $\frac{\pi}{5}$ radian at its centre. If current $i$ is flowing in it, then the magnetic induction at its centre is ($\mu_0$ = permeability of free space).
- A$\frac{\mu_0 i}{4r}$
- B$\frac{\mu_0 i}{8r}$
- C$\frac{\mu_0 i}{16r}$
- D$\frac{\mu_0 i}{20r}$
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