Hi there,

I was frustrating by this problem for a long time.
I got some answers, but it looked wierd...
So, I come here for help.

Determine the magnetic polarizability of an isotropic conducting
cylindrical tube with outer radius a and inner radius b in a uniform
periodic external magnetic field. The external field is perpendicular
to its axis and satisfied quasi-static EM field condition.
We want to find the field in the tube.

This problem is similar to the problem in Landau's book Section 59
"Depth of penetration of a magnetic field into a conductor", Problem
2. But, now the solid cylinder is replaced by a cylindrical tube.

I need a general solution for that, not when the skin-depth is much
thicker than the thickness of the tube wall.
I believed some one has already done it analytically before.
Please provide me any reference or paper with your answer.