A current I flowing through the loop as shown in figure. The magnetic field at centre O is :

The effective magnetic field at OB=BPE+BRS=μ04π·32πIR+μ04π·π2.I2R⇒B=μ0I4R32+14=716μ0IRAs per Fleming's Right Hand rule, direction of magnetic filed is perpendicular and in the plane of paper.