Using the formulation for a layered sphere in a plane wave field and specializing to the quasi-static range, we have obtained a solution for the electromagnetic response of a conductive sphere surrounded by a shell which is also conductive. The mathematical model is intended to simulate the geological situation of a massive sulfide body enclosed by a halo of disseminated sulfides.The in-phase and quadrature responses are presented as two-dimensional functions of the sphere and shell induction numbers and as one-dimensional functions of frequency for particular cases. It is demonstrated that, depending upon the respective induction numbers, the sphere and shell may respond separately in different ranges of frequency.

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