Abstract
This paper presents an analytical solution for the change in impedance in a coil due to the presence of a conducting double-layered sphere symmetrically situated with respect to the coil. In the case where the relative magnetic permeability, /spl mu/(r)=r/sup /spl alpha//, of the outer sphere is a function of the distance r from the center of the sphere, where a is an arbitrary real number, the solution is expressed in the form of a series containing Bessel functions and can be used to compute the change of impedance. Numerical results for the case /spl alpha/=-2 are presented. >
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