A ring of ferromagnetic material has a rectangular section. The inner diameter is 15 cm. The outer diameter is 24 cm. And the thickness is 5 cm. There is a coil of 500 turns wound on the ring. When...

A ring of ferromagnetic material has a rectangular section. The inner diameter is 15 cm.
The outer diameter is 24 cm. And the thickness is 5 cm. There is a coil of 500 turns wound on
the ring. When the coil has a current of 10 A, the flux in the core is 0.0007 Wb. The
average length of the ring is Ln=0.66m Determine:
a) The magnetomotive force.
b) The intensity of the magnetic field and the flux density.
c) Reluctance, permeability and relative permeability.