$A$ current $i$ flows in a circular arc of wire of radius $R$,which subtends an angle of $3\pi / 2$ radians at its centre. The magnetic induction at the centre is
- A$\frac{\mu_0 i}{R}$
- B$\frac{\mu_0 i}{2R}$
- C$\frac{2\mu_0 i}{R}$
- D$\frac{3\mu_0 i}{8R}$
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