A circular wire loop of radius R is placed inthe x-y plane centred at the origin O. A square loop of side a(a >> R) having two turns is places with its centre at z = 3R along the axis of the circular wire loop, as shown in figure. The plane of the squre loop makes an angle of 450with respect to the z-axis. If the mutual inductance between the loops is given by μ0a22P/2R , then the value of P is