A circular loop of wire with a diameter (2R) of 0.4 m carries a current I = 5 A and is lying in the x-y plane in the presence of an external magnetic field aligned along the z-axis; the entire system is in vacuum. What is the magnetic potential energy (in mJ) of this system if the magnitude of the external magnetic field is 0.9 T? X X X X X x X X X X x 1 x X X X X X X X X X X Type your