Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 45

Consider the magnetic circuit in Figure. A current of 3 (A) flows through 200 turns of wire on the center leg. Assuming the core to have a constant cross-sectional area of 10 - 3 (m 2 ) and a relative permeability of 5000:
a) Determine the magnetic flux in each leg.
b) Determine the magnetic field intensity in each leg of the core and in the air gap.
Figure: A magnetic circuit with air gap