For the scattering field caused by the finite - length conducting and permeable cylinder , the boundary condition that the normal component of electrical strength is zero in conducting medium , i . e . en = 0 , was used to determine the separation constant of boundary value problem in the past
2.
Considering that the ferrite core is often made from good permeable material , the dissertation presents the condition that the normal component of the magnetic field strength is zero approximately at the inside surface of good permeable material , i . e . bn = 0 to determine the eigenvalues for the separation constant . during the solving process , the solenoid coil is supposed to be wound closely by infinite symmetrical delta - coils
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