A current loop consists of two identical semicircular parts each of radius R, one lying in the x-y plane and the other in x-z plane. If the current in the loop is i, the resultant magnetic field due to the two semicircular parts at their common centre is

• A. \[\frac{{{\mu }_{0}}i}{\sqrt{2}R}\]
• B. \[\frac{{{\mu }_{0}}i}{2\sqrt{2}R}\]
• C. \[\frac{{{\mu }_{0}}i}{2R}\]
• D. \[\frac{{{\mu }_{0}}i}{4R}\]