5. The transformer shown in the figure below consists of a long wire coincident with the z-axis carrying a current Ilocos at, coupling magnetic energy to a toroidal coil situated in the x-y plane and centered at the origin. The toroidal core uses iron material with relative permeability ur, around which 100 turns of a tightly wound coil serves to induce a voltage Vemy, as shown in the figure. Iron core with m