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ebook (Engineering electromagnetics) Nathan Ida. third edition. page 581. there is a lot of references that say the same thing.

"The second type of interface discussed here is that between a perfect dielectric and a perfect conductor. In this case, the overriding condition is that of the conductor, that is, that all fields in the perfect conductor must be zero. Assuming material (2) is the perfect conductor, E2t, H2t...

The litterature say that the magnetic field inside a perfect conductor is equal to zero. If it's not a perfect conductor, the magnetic field will penetrate until the skin depth.

According to the literature, it's the boundary condition of the magnetic field at the interface of dielectric-perfect conductor.

Hi While studying the shielded wires, i noticed that the magnetic field of the inner conductor can penetrate the shield conductor (can be calculated in the region 3). However, the boundary condition of the magnetic field at the surface (between dielectric and perfect conductor) of a perfect...

Hi, While studying the coaxial cable, i noticed that the magnetic field of the inner conductor can pass through the hollow conductor (can be calculated in the region 3). However, the boundary condition of the magnetic field at the surface (between dielectric and perfect conductor) of a perfect...