A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle \[3\pi /2\] radian at its centre. The magnetic induction B at the centre is

• A.            \[\frac{{{\mu }_{0}}i}{R}\]
• B.            \[\frac{{{\mu }_{0}}i}{2R}\]
• C.            \[\frac{2{{\mu }_{0}}i}{R}\]
• D.            \[\frac{3{{\mu }_{0}}i}{8R}\]